后卫的英文：
(n) backfield
fullback
rear guard

参考例句：

He is thrusting down the middle and dribbling past a fullback.
他带球中路突破晃过了一名后卫。

A quick pass to a back running toward the sideline.
向朝边线跑的后卫传的一种快传球

The quarterback faked to the fullback and handed off to the halfback.
四分卫做了个要把球传给后卫的假动作，却把球传给了中卫。

There are also three lines on the flank facing south, north and west and the rear guards.
另有面南、面北、面西而立的三列横队为侧翼和后卫部队

Hey, what's wrong with the full-backs on the visiting side?
嗨，客队的后卫怎么啦?

Smith will play fullback.
史密斯将任后卫。

Jack is a full back of the team.
杰克是球队的后卫队员。

The full-back brought him crashing to the ground,ie caused him to fall heavily.
后卫把他倒在地.

an all - American fullback.
全美最佳后卫

John plays back in the team.
约翰在这个队打后卫。

backfield是什么意思：
n. 后卫;外野手

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。

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

fullback是什么意思：
n. 后卫

He's beaten the fullback and is racing towards the goal
他冲过了后卫，而且直奔球门。

He is thrusting down the middle and dribbling past a fullback.
他带球中路突破晃过了一名后卫。

The quarterback faked to the fullback and handed off to the halfback.
四分卫做了个要把球传给后卫的假动作，却把球传给了中卫。

rear是什么意思：
n. 后方；后部，背面；臀部
adj. 后面的；后部的
v. 饲养；培养；暴跳；树立；高耸；抬起

The rear sight of a firearm.
枪的表尺，后瞄准器 。

The hen rears her brood.
母鸡孵育一窝鸡雏。

The horse kicked him in the rear.
马蹄踢在他的屁股上。