补防在篮球比赛中，当本方一名防守队员失去位置，进攻球员持球突破且有直接得分的可能时，邻近的另一名防守球员立即放弃自己的防守对象，去防持球突破的进攻者。
n. filling-in
misc. fill in
每次我要去补防他的时候，一转身，他就已经到篮下了。
Every time I tried to help on him and turned around, he was already at the basket.
防守上，在他需要去补防时他给那些矮点的防守球员一些帮助。
On defense, when he has to help he gets out to the smaller defenders OK.
后卫队员的防守能力包括抢篮板球、抢断球、盖帽、协防和补防能力。
The ability on defending include: grab rebounds, steals the ball, blocked shots, the ability to assist in the defense and anti-complement.
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