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.

youdao

本协议有效期为一年。

The duration of this agreement is one year.

youdao

本协议的有效期已过。

The period of validity of the agreement has expired.

《牛津词典》

本协议从签署之日开始有效期两年。

This agreement is effective for two years from the date of signing.

youdao

本协议从签署之日开始有效期两年。

This agreement is effective for two years from the date of signing.

youdao