名词
中文翻译：后卫
同义词：
['safety', "backline player例句：1. The fullback was the key to our team's defense.（这位后卫是我们球队防守的关键。）"]
例句：
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1. The fullback was the key to our team's defense.
这位后卫是我们球队防守的关键。
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2. He is a professional fullback who has played in many top-level teams.
他是一名职业后卫，曾在许多顶级球队效力。
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3. The fullback made a crucial tackle during the game.
在比赛中，这位后卫完成了一次关键的抢断。