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年华是无效信。
Time is invalid letter.
youdao
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克必信对病毒感染无效，比如普通感冒或流感。
Cubicin will not treat a viral infection such as the common cold or flu.
youdao
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不可以，这样的推荐信无效， 而且严格讲是一种作弊行为。
No, this is not OK. Strictly speaking this is a form of cheating.
youdao
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不可以，这样的推荐信无效， 而且严格讲是一种作弊行为。
No, this is not OK. Strictly speaking this is a form of cheating.
youdao