求解释 互惠互利 的英文翻译，详情请看补充问题：

我们希望在保证质量、互惠互利以及交易彼此需要的货物的基础上和你们建立业务关系。他的翻译是： We'd like to express our desire to establish business relationship with you on the basis of quality, mutually benefit and exchange of needed goods .
问 为什么互惠互利翻译成mutually benefit 而不是 mutually beneficial 或者 mutual benefit ？这是什么原因？这三个词有什么区别？ 求好心人解答，谢谢！

其实应该用mutually benefit ，但不能用mutually beneficial ，因为这里应该用名词短语，与quality, 和 exchange of needed goods 并列，做 of 的宾语。
你能看出问题说明你语法不错。

我们口译书上翻译的是 mutual benefit.

fair trade is that the negotiating parties to adhere to the principle of mutual benefit, and to make appropriate compromises.

Mutual benefit

quality,benefit,exchange三者为并列的名词 则修饰benefit的应为adj:mutual,即mutual benefit