exchange error

例句：

1. 1. They exchanged information about their research findings.
   他们交换了关于他们研究结果的信息。
2. 2. The two countries have been exchanging diplomats for years.
   这两个国家多年来一直在互派外交官。
3. 3.He exchanged a few words with his friend before leaving the room.
   他离开房间前和一个朋友交换了几句话。