The operative period of the National response is from 2008 to 2011.
证书的有效期是三年,除非有其他原因取消证书。
The validity of the certificate will be three years, unless there are other reasons to cancel the certificate.
有人反对这项提议说,证书的有效期是能够有效进行数字签字的时期。
In opposition to that proposal,it was pointed out that the operational period of a certificate wasthe period during which a digital signature could be created validly.
食品的有效期是为了公共安全而制定的,因为许多易腐烂的食品在过期后会变得有害。
Expiration dates for food are put into place for public safety, as many perishable foods become harmful after they expire.
药品上标记的有效期是FDA和药厂保证药物有效性的时间,通常是两年或三年。
The dates on labels actually indicate how long the FDA and pharmaceutical companies guarantee effectiveness, which is typically two or three years after manufacture.
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