英文是Valid period。
“有效期”的中英文对照例句：
这个胶卷已过了有效期。
This film has passed its expiry date.
在保单有效期内，所缴纳的保险费是有保障的。
Premiums are guaranteed throughout the term of the policy.
本保证书自购置此产品之日起有效期为一年。
This warranty is good for one year after the date of the purchase of the product.
您在一个表中维护过去、现在和未来的有效期和它们的关联数据。
You maintain past, present, and future effective dates and their associated data in a single table.
这比过去的疫苗有效期长了四个月。这种疫苗将被用来给中国河流、湖泊和中的禽类进行接种。
This is four months longer than with previous vaccines.
这两个日期设置了有效期的界限。
These dates set the boundaries of the validity period.
本协议有效期为一年，友好协议可以延长。
This Agreement is valid for one year, and friendly agreement can be extended.
你同样也必须要有介绍信和至少六个月的护照有效期。
You must also have a letter of introduction as well as at least six months left on your passport.
有效；处在有效期中或者仍然有效。
Be in effect; be or remain in force.
有效期：30日这一日期的报价。
Validity: 30 date of this quotation.