1
be a/an + [noun]
linebacker 是可数名词，指球员时用不定冠词 a。
He is a linebacker for the Green Bay Packers.
他是绿湾包装工队的线卫。
线卫
先理解核心含义，再看它在真实句子里的用法。
线卫
A defensive player in American football who lines up just behind the linemen.
He is a linebacker for the Green Bay Packers.
他是绿湾包装工队的线卫。
指美式橄榄球中的防守球员；不是足球里的中后卫。
位于防守锋线之后、安全卫和角卫之前的防守球员,主要负责擒抱跑球者并防守短传。
The defensive players who are in position behind the defensive linemen and in front of the safeties and cornerbacks and whose principal responsibilities are to tackle runners and to defend against shorter passes.
The linebacker blitzed through the offensive line and sacked the quarterback.
线卫冲过进攻线并擒抱了四分卫。
Our team's best linebacker missed the game due to injury.
我们队最好的线卫因伤错过了比赛。
The coach asked the linebacker to cover the tight end.
教练要求线卫去盯防近端锋。
linebacker 是可数名词，指球员时用不定冠词 a。
He is a linebacker for the Green Bay Packers.
他是绿湾包装工队的线卫。
指担任某个位置时，play 后直接接位置名词，不加冠词。
She played linebacker in college before switching to safety.
她大学时打线卫，后来改打安全卫。
as a/an 表示“作为……”，常用于说明身份或角色。
As a linebacker, you need to be fast and strong.
作为线卫，你需要既快又强壮。
Not this
He is best linebacker on the team.
Use this
He is the best linebacker on the team.
linebacker 是可数名词单数，而且 best 是最高级，形容词最高级前通常要用定冠词 the，所以不能说 He is best linebacker。
Not this
He is one of the best linebacker on the team.
Use this
He is one of the best linebackers on the team.
在 one of the + 最高级 + 名词 的结构中，名词要用复数形式，表示“其中之一”，因此必须说 one of the best linebackers。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
中线卫
The middle linebacker called out the defense's signals.
中线卫喊出防守组的信号。
外线卫
He plays outside linebacker for the team.
他为球队担任外线卫。
内线卫
The inside linebacker slipped through the gap to stop the run.
内线卫穿过缝隙截停了跑动进攻。
线卫群
The team's linebacker corps is the strongest in the league.
这支球队的线卫群是联盟中最强的。
线卫位置
The athlete was recruited to play the linebacker position.
这名运动员被招募去打线卫位置。
Use linebacker naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住“线后”：站在进攻线(line)后方(back)的防守队员就是linebacker。
语域：neutral 常见场景：美式橄榄球比赛解说、体育新闻报道、球队战术讨论 通常用于美式橄榄球相关场景，属于专业术语，比较常见于体育新闻、比赛解说和战术讨论中，日常口语中较少使用。
None of these words rhymes with 'linebacker' as a whole. 'backer' is a spelling lookalike because it ends in 'backer' but has different stress. 'line' and 'fine' rhyme with each other and match the spelling of the target's first element, but they do not rhyme with the full word. 'back', 'quarterback', and 'cornerback' share the spelling chunk 'back'.
Dictionary facts from ECDICT, WIKTIONARY.