形容词
中文翻译：不付费的
同义词：
['unpaid', 'unearned', 'unreimbursed']
例句：
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1. The project was unpaid until the end of the year.
这个项目直到年底才得到支付。
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2. The company is unpaid for their work done in the past month.
该公司对他们过去一个月的工作未支付报酬。
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3. The unpaid bills will have to be paid before the end of the month.
这些未付账单将在月底前支付。