互利互惠的英文：
reclprocity

It is mutually beneficial and reciprocal to do this deal with the Japanese.
与日本人做这笔生意，互利互惠。

Now that we’ve got to know each other better, I’m certain we can do more business to our mutual benefit.
既然我们彼此更加了解了，相信今后我们能做成更多的互利互惠生意。