名词短语
中文翻译：有效期
同义词：
['validity period', 'validity term']
例句：
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1.The contract has a term of validity of three years.
该合同的有效期限为三年。
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2. The agreement is valid until the end of the term of validity.
协议有效期至有效期结束。
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3. The product has a validity period of six months.
该产品的有效期为六个月。