Sag: a defensive tactic in which a player drops off his man to help double-team a player in the pivot.
协防(sag)：一种防守战术。球员放弃自己防守的队员来帮助在中线的队友。
A player who comes to a stop on the count of one may pivot , using either foot as the pivot foot.
当球员在第一步结束就选择停止时，他可以选择任何一只脚作为中轴脚进行转动。这是合法的。
If a player, with the ball in his possession, raises his pivot foot off the floor, he must pass or shoot before his pivot foot returns to the floor.
就是说在投篮和传球时，球员可以抬起中枢脚，但在中枢脚落回地面前必须完成出手。
If a player, with the ball in his possession, raises his pivot foot off the floor, he must pass or shoot before his pivot foot returns to the floor.
就是说在投篮和传球时，球员可以抬起中枢脚，但在中枢脚落回地面前必须完成出手。
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