名词
中文翻译：有效期
同义词：
['validity period', 'validity term', 'validity interval']
例句：
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1. The contracthas a validity period of three years.
合同有效期为三年。
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2. The product has a validity period of one year.
产品有效期为一年。
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3.The validity period for the license is six months.
许可证的有效期限为六个月。