exchange of instruments of ratification

例句：

1. 1. They exchanged their stories about the trip to each other's homes.
   他们互相交换了关于旅行的故事。
2. 2.The company exchanged its shares for new ones.
   公司用新的股票交换旧的股票。
3. 3.The two countries have been exchanging diplomatic messages.
   这两个国家一直在交换外交信息。