WO 2006/125378 PCT/CN200 6 /001029 Multi-purpose Underwear and Lower Garment Technical field This invention relates to a multi-purpose underwear and a lower garment Background of this invention BaRecently low-slftg pants have bome a new fashion trend in USA. The incantiois exposure of buttocks cleavage when some females are in low-slung pants draws the attentions of insiders. Then low-slung pants become a new fashionable style. "Exposure of buttock cleavage is absolutely the most fashionable dress, minor exposure will be pretty sexy." said Douglas, a fashion editor of Cosopolitan, a magazine for women. This fashion spreads Hollywood where dressing styles of celebrities are always trendsetters in fashion so that many young people become interested in low-slung pants, in which these young people walk proudly in streets. However, indecent exposure of underwear edges when one stoops down greatly degrades his/her taste in fashion. Additionally, current underwear is tedious in undressing and dressing, especially under toilet and underwear changing. It is a widely-known technology whereby thongs contain. However, these products are relatively simple, both in functionality and convenience. Contents of the invention In order to guard against these defects, this invention relates to a multi-purpose underwear that is simple, conveniet and invisible when stooping down, while a lower garment herein is also provided. Technical scheme for this invention is as follows: One type of multi-purpose underwear comprises underwear panels where one strap at least is respectively set on its three edges. One strap at least herein refers to one piece of strap or above, its actual number subject to common technician from this industry in the light of actual conditions. It is easy to understand when said total straps are four or three pieces. At four pieces of straps, one piece at least shall be placed at each edge so that two pieces are in parallel. Adopting four is better. Generally the said strap is elastic ones. Alternatively, inelastic conummon straps may be used. In straps place a device that can control the length of straps. It is preferential to select either Velcro nylon hasp or buckle. Further, symbol or scale showing large, middle and small size is placed. In edges of said straps or underwear panel place connections. Detailed description for this solution as follows: the connection shall be placed at edges of said straps or underwear panel. Or the connection is supported on edges of both said straps and underwear panel, and two connections shall be placed at the edges if two straps are used at edges of underwear panel. The preferred connection is one of button, snap button, glue cloth or hook. The better connection is either snap WO 2006/1l5378 ?CT/CN2006/001029 button or hook. Details as follows: connecting hole shall be placed both edges of upper section and lower section in underwcar panel, e.g., directly drilling or inlaying setting ring for connection, thread gluing or 8 shaped button. The preferred underwear panel is triangular. nt is below Technical scheme applied in invented multi-purpose underwear and lower garment is below. The lower garment comprises trouser that may be one of lower garments such as skirts, pants and pantskirt. In such a trouser connects multi-purpose underwear tat comprises underwear panel that generally are 100% cotton or fabrics with good adsorptive capacity for hueoral fluid, also adopts unrecoverable fabrics. At least one strap shall be respectively placed at three e dges of said underwear panel, and said multi.purpose underwear connects with trousers at edges of straps that can be four or three. The better is four, among which two is in parallel. Normally, at lower edge place two straps. Altsativoly, these two straps appear in the manner of zipper or bunchy ring for two in one. Bunchy ring can use elastic or inelastic material, namely either elastic strap or inelastic strap. In straps institute a device that can regulate the length of strap, either Velcao nylon hasp or buckle, or other regulating unit. At edges of strap place a connection that may be button, snap button (gluing cloth) or hook. Underwear panel is triangular, of course other proper shapes. The better underwear panel has a sown lining in inner side that eain at can be made by one material with excellent adsorptive performance for humoral fluid, for instance, 100% cotton. Sewing an inner lining in underwear panel has been a widely-known technology. In said trousers place three connection points, of which two points are respectively placed both sides of trouser front, and the third at trouser rear. Straps of said multi-purpose underwear severally connect with trousers at said three points. This invention is characterized by adoption of strap-type structure for improvable convenience, and no exposure when stooping down, as well as different combination dressings as required. Furthermore, this invention may not leave depressed line i skin after wearing. What's more, less use of fabrics, full considering the sanitary requirement, has a pleasantly cool effect, thus gaining the popularity among females. Meanwhile, pregnant woman, more especially in anaphase, has difficulty getting abou especially in undressing and dressing. However, use of the invention relieves the trouble in trouser change. In this invention, the adoption of separate-type design for bunchy strap and fabrics of traditional underwear enables components to be produced automatically so as to improve the efficiency of production and reduce the labor cost- By doing so, aseptic packaging can be given to each separate components to finally produce aseptic multi-purpose underwear. This closes an international gap. BRIEF DESCPJRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram of multi-purpose underwear of Instance Graph 1 FIG. 2 is a reference diagram under use condition for Instance Graph 1 4 WO 2006/125378 PCT/CN2006/0010 29 FI03 is another reference diagram under use condition for Instance Graph 1 FIG.4 is a structural diagram compnrsig a lower garment of multi-purpose underwear in Instance Graph 1 FIG 5 is a structural diagram comprising a lower ganment of multi-purpose underwear in Instance Graph 3 FIG7 6 is a structural diagram of multi-purpose underwear in Instance Graph 43 FI7. 8 is a structural diagram of multi-purpose underwear in Instance Graph 4. FlU3 s is a structural diagram of multi-purPofl underwear' in instance Graph 4. Detailed construction mode: Detailed description, see the following FIGs and instance graph. See FIG I, showing a multi-purpose underwear in instance graph 1 comprising underwear panel I where respectively places one strap 2, one strap 2 and two straps 2 at edges. Said total straps are four, among them, two is in parallel. In this instance, double straps are placed at medium and lower section, while a bunch ring is placed at upper section for two in one when sithe ring down. Bunchy ring is an elastic rubber one and it is an elastic strap for this case. In said straps places a buckle 3 that can control the length of strap. The buckle for this case is a common shaped ring. At edges of strap sets a connection. In this instance, it is a hook at one edge and a banging ring for connection 4. Underwear panel 1 is triangular, and selected material in this instance is cotton products. In inner side of underwear panel adds a lining which is made by germ-proof and sweat-absorbent 100% cotton (not shown in the FiG). See FIG2, a reference diagram of multi-purPose underwear under use condition for instance graph 1 wherein comprises trouser 5 with the multi-purpose underwear. The said underwear comprises underwer panel I choosing 100% coon. At three edges of underwear panel 1 respectively place straps 2 totanzing four wherein one at lower portion fits together at left upper portion, forming a lateral ring while another strap at lower portion connects with the strap at right upper portion, thus forming another lateral ring. When wearing by the wearer, both legs can pass through these two lateral rings, Straps 2 are resilient band wherein a buckle regulating the length of strap is set. At edges of straps 2 places the connection 4. See FI13, another reference diagram of multi-purpose underwear under ,ust operation for instance graph 1. A multi-purpose underwear is attached to trouser 5. The said multipurpose underwear comprises underwear panel I with selection of floss texture fabrics. At three edges of underwear panel 1 respectively place straps 2 totalizing four, among which straps at both right and left sides of the upper portion fit together, forming a circular girdle ring while two straps at the lower portion are incorporated into one fitting together with rear and middle portion of above-described round girdle ring, thus forming an imitative briefs. Straps 2 are resilient bands wherein the buckle regulating the length of strap is placed. At edge of straps installs the connection 4.S PCT/CNZ006/001029 WO 2006/125378 See FI1G.4, a structural diagram comprising a lower garment of multipurpoSe underwear in instance graph 1. Inside trouser 5 attaches multi-PurPose underwear 6 that comprises underwear panel 1 where one strap 2 is respectively placed at three edges thereof, totalizing four. In said trouser respectively place three connecing points 7, among which two is placed on both sides of trouser eront vand another is set on the rear of trouser 5. All straps at said underwer respectively trconnect with aboVedsCibed connecting points of trouser. These connecting points can be placed connect with above-de Strap 2 is resilient band wherein the buckle 3 regulating the length of strap inwardly or outwardly. Strap2isrs 4 that is a book. Underwear Panel hlas a is placed. At edge of straps 2 places a connection 4 that is a ook. Und erwear panel has a10 triangular shape and adds an inner lining that is made by germ-proof and sweatbsorbet 100% cotton (not shown in the FIG). the lowr garment of ulti-ppo underwear in See FIGS.5, a structural diagram compisimg the lower gaent of utirpose nd terwear in one instance graph 2, different from instance graph I in FiG4 in total straps 2 of three, and two in one after connecting with trouser rear 5. se underwear in instance graph 3. The See FIG.6, a structural diagram of nulti-pupos cs un derwear pan e 1 where mrnulti-purpose underwear of instance graph 3 shown in FIG6 comprises unaid total straps are fourpanel where three edges respectively set one strap 2, one strap 2 and two straps 2. Said total straps are four, among which two is in parallel. The strap is elastic band for this case. In said straps installs a bucle that can regulate the length of strap, and the buckle for this case is common 8 shaped rings. At edge of strap places a connection, and accordingly at edges of underwear panel. Connection 4 for this case is hook combination. From the FIG, connection 4 has one hook at one edge and one hanging ring at the other one. At three edges of underwear panel 1 place three hanging rings inwardly, ain difference See FIG.7, a structural diagram of multi-urpose underwear in instance graph. Main difference between instance graph 4 and instance graph 3 in .6 is that underwear panel I in instance graph 4 has three sewn hanging rings for three connection 4 at there outer edges. See FIG8, a structural diagram of strap 2. From the FIG, it can be seen that strap 2 has scale 10, respectively large small and medium size, by which it can be regulated so as to manufacture one ulrespectiuvpo underwear comprising all sizes using the strap of this kind. Although the invention has ade detailed description and cited the prefrrd cases, common technician in this trade obviously provides various alternative plans, amend and alter it according to said description- Therefore, all said alternative plans, amendment and aeration shall be included within spirit and scope of Patent Claim. 6