物品交换

例句：

1. 1. They exchanged their stories about the trip.
   他们交换了关于旅行的故事。
2. 2. The two countries have been exchanging diplomats.
   这两个国家一直在交换外交官。
3. 3.She exchanged a few words with him before leaving.
   她离开前和他交换了几句话。