名词
中文翻译：后卫
同义词：
['safety', 'safety net', 'back-up', 'backup player']
例句：
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1.The cornerback was a standout performer in the game.
这位后卫在比赛中表现突出。
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2. He is a safety who can cover both sides of the field.
他是一名可以覆盖全场两侧的后卫。
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3.In football, the cornerback is responsible for covering the entire field.
在足球中，后卫负责覆盖整个场地。