diplomatic：
adj.外交上的;外交人员的;有手腕的;策略的
foreign affairs：
n.外事;外交事务;洋务
他们两个之间的区别：
首先，diplomatic是一个形容词，而foreign affairs是一个名词词组。
其次，虽然这两个词都有外交方面的意思，但是diplomatic也有有手腕，有策略，婉转的意思。而foreign affairs只是单纯地表示外交事务，洋务等
diplomatic用在句子中有：
Efforts are being made to avert war and find a diplomatic solution
各方正在为避免战争、寻求外交解决途径而作出积极的努力。
She is very direct. I tend to be more diplomatic, I suppose.
她人很直，我觉得我更婉转一些。
foreign affairs用在句子中有：It was his responsibility for foreign affairs that gained him international prestige.
他在负责处理外交事务的过程中赢得了国际声望。
They contested for the position of minister of foreign affairs.
他们在竞争外交部长的职位。
