形容词
中文翻译：额外的
同义词：
['additional', 'additional to']
例句：
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1. We have an extra day off this week.
这周我们有一个额外的休息日。
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2. The extra workload has been a challenge for the team.
额外的工作量对团队来说是一大挑战。
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3. I'll bring an extra set of clothes just in case.
我会带一套额外的衣服以防万一。