trade尤指買賣貨物，也可表示交換物品。

　　例句：

　　The exchange of prisoners took place this morning.

　　今天早上交換了俘虜。

　　What is needed is a frank exchange of views.

　　需要的是坦誠地交換意見。

　　We need to promote an open exchange of ideas and information.

　　我們需要促進思想和信息的公開交流。