1. 书信往来：correspondence通信 | exchange of letters书信往来 | acknowledgement of receipt回执
2. 交换的函件：进行交换-----enter into any exchange | 交换的函件-----exchange of letters | 交换的照会-----exchange of notes
3. 换文; 换函：Exchange of information on national economic policies (of member countries(成员国)交换国家经济政策信息(交换信息EI... | exchange of letters;换文; 换函;; | exchange of non-monetary assets;交换非货币资...
4. 换函 条约法：132 equally authentic 同一作准 条约法 | 133 exchange of letters 换函 条约法 | 134 exchange of notes 换文 条约法
1. That was evidenced by the piles of signed contracts and letters of intention on aid, exchange and partnership programmes.
2. exchange of letters在线翻译
2. The Shanghai Stock Exchange also sent letters to securities companies related to large trading volumes of warrants and ordered them to strengthen regularities.