n.后卫
外野手.
The position of the football player in the backfield who directs the offensive play of his team. 足球队中处在后场直接指挥进攻的队员的位置。
The backfield player whose position is behind the line of scrimmage and who usually calls the signals for the plays. 四分卫后场运动员，位置在开球线后面，通常为比赛发号指令
A primarily defensive backfield player in field hockey, soccer, or rugby whose position is near the defensive goal or goal line. 防守后卫在曲棍球、英式足球或英式橄榄球比赛中，主要在守卫区防守的位于防守球门或球门线附近的队员
An offensive backfield player whose position is behind the quarterback and halfbacks and who primarily performs offensive blocking and line plunges. 进攻后卫位于四分卫和中卫之后的在守卫区进攻的队员，主要在对方守区内拦球和越过对方开球线
(football) a person who plays in the backfield. （足球）在后卫位置的人。
