The period of validity of the agreement has expired.

本协议的有效期已过。

Its period of validity is 12 months.

有效期12个月。

All signed plug-ins have a period of validity.

所有签名插件都有一个有效期。

What is the period of validity of this L/C?

这张信用证的有效期是多久？

The period of validity of Yinju Granule was 12 months.

银菊颗粒的有效期为12个月。