形容词
中文翻译：有效的
同义词：
['valid', 'validating', 'validly', 'validly-enforcing']
例句：
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1. Thenew policy is expected to be valid for a year.
新政策预计将有效一年。
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2.The law is valid only if it is written down in the statutes.
法律只有在成文法典中才有效。
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3.The certificate is valid until the end of next month.
该证书有效期至下月底。