MD。羽毛球比赛英文缩写中MD代表的是男子双打，意思是Men'sDoubles，也被使用为男子双打的比赛代号。同样的类似的语言还有男单MS全称Men'sSingle，女单WS全称Women'sSingle。

Badminton is a racquet sport played by either two opposing players (singles) or two opposing pairs (doubles). The players or pairs take positions on opposite halves of a rectangular court that is divided by a net.

Unlike many racket sports, badminton does not use a ball: badminton uses a feathered projectile known as a shuttlecock. Since the shuttlecock is strongly affected by wind, competitive badminton is always played indoors.

General Description

The players strike the shuttlecock with their rackets so that it passes over the net and into the opponents' half of the court. The rally ends once the shuttlecock touches the ground: every stroke must be played as a volley. In doubles, either player of a pair may hit the shuttlecock (except on service), but only a single stroke is allowed before the shuttle passes again into the opponents' court (unlike volleyball). Players are awarded a point if the shuttlecock lands on or within the marked boundary of their opponents' court, or if their opponent's stroke fails to pass the net or lands outside the court boundary.

A rally begins with the service, in which the serving player must strike the shuttlecock so that, if left, it would land in the diagonally opposite service court. In doubles, only one player, the receiver, may return the service (thereafter either player may hit the shuttlecock); the order of doubles service is determined by the Laws, which ensure that all the players shall serve and receive in turn. If the server wins the rally, he will continue serving; if he loses the rally, the serve will pass to his opponent. In either case, the winner will add a point to his score.

A match consists of three games; to win each game players must score 21 points (exceptions noted below). There are five events: men's singles, women's singles, men's doubles, women's doubles, and mixed doubles (each pair is a man and a woman).

羽毛球

羽毛球可由天然材料、人造材料或用它们混合制成。只要球的飞翔性能与用天然羽毛和包裹羊皮的软木球托制成的球的性能相似即可。

4.1 一般式样

4.1.1 羽毛球应有16根羽毛固定在球托部。

4.1.2 羽毛长64毫米至70毫米。但每一个球的羽毛从托面到羽毛尖的长度应一致。

4.1.3 羽毛顶端围成圆形，直径为58毫米至68毫米。

4.1.4 羽毛应用线或其他适宜材料扎牢。

4.1.5 球托直径25毫米至28毫米，底部为圆形。

4.2 羽毛球重4.74克至5.50克。

4.3 非羽毛球制成的球

4.3.1 用合成材料制成裙状或羽毛。

4.3.2 球托如规则4.1.5所述。

4.3.3 尺寸和重量同4.1.2、4.1.3和4.2；但由于合成材料与天然羽毛在比重、性能上的差异，可允许不超过10%的误差。

4.4 球的检验

4.4.1 验球时，站在端线外，用低手向前上方全力击球，球的飞行方向须与边线平行。

4.4.2 一个具有正常速度的球，应落在离对方端线530-990毫米之间的区域内。

4.5 非标准球

只要球的一般式样、速度和飞翔性能不变，经有关国家组织批准，可以变通以上条款。

4.5.1 由于海拔或气候等条件不宜使用标准球时。

4.5.2 如情况特殊，必须更改才有利于开展比赛时。