两国领导人签署了一项重要的贸易协定。

Liǎng guó lǐngdǎo rén qiānshǔ le yī xiàng zhòngyào de màoyì xiédìng.

The leaders of the two countries signed an important trade agreement.

总统今天签署了新的移民法案。

zǒngtǒng jīntiān qiānshǔ le xīn de yímín fǎ'àn.

The president signed a new immigration bill today.

双方正式签署合作协议，项目即将启动。

shuāngfāng zhèngshì qiānshǔ hézuò xiéyì, xiàngmù jíjiāng qǐdòng.

Both parties formally signed a cooperation agreement, and the project is about to launch.