名词
中文翻译：Unknown
同义词：
['term', 'validity period', 'validity date']
例句：
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1. The bank will not honor the check if it is not within the validity period.
如果支票不在有效期内，银行将不予兑现。
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2. The contract has a validity period of three years.
合同有效期为三年。
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3. The validity period for this product starts from January 1st and ends on December 31st.
该产品的有效期限从1月1日开始至12月31日结束。