形容词
中文翻译：有效的
同义词：
['valid', 'validating', 'validly']
例句：
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1.The new policy is valid for the next three months.
新政策有效期为三个月。
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2.The evidence is valid, but we need to consider other factors as well.
证据有效，但我们还需要考虑其他因素。
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3. The contract is valid until the end of the year.
合同有效期至年底。