名词短语
中文翻译：合同期限
同义词：
['term', 'duration', 'lifespan', 'termination date']
例句：
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1. The agreement has a three-year life of contract.
该协议有三年的有效期。
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2. The company's business plan has a five-year life of contract.
公司的业务计划有五年的有效期。
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3. The lease has a two-year life of contract.
租赁合同有两年的有效期。