名词中文翻译
中文翻译：有效性
同义词：
['validity', 'validity period']
例句：
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1.The product's validity period is three years.
该产品的有效期限为三年。
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2.The validity of the contract is being challenged by the court.
合同的有效性正受到法院的挑战。
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3.The validity of the agreement was questioned during the negotiations.
协议的有效性在谈判期间受到了质疑。