形容词
中文翻译：未到期的
同义词：
['unexpired', 'unexpired']
例句：
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1.The check is undated, so it's not expired yet.
这张支票是未到期的，所以还没有过期。
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2.The company's stock is undated, so investors don't need to worry about expiration dates.
公司的股份是未到期的，所以投资者不需要担心到期日期。
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3. The contract was undated, so we can't assume that it will expire soon.
合同是未到期的，所以我们不能假设它很快就会到期。