形容词
中文翻译：多余的
同义词：
['superfluous', 'superadded', 'superfluous']
例句：
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1. The extra staff will help us to complete the project on time.
额外的员工将帮助我们按时完成项目。
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2. The extra charge is for the upgraded service.
额外费用是升级服务的费用。
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3. The extra baggage caused a delay in our departure.
额外的行李导致我们的出发延迟了。