相互利益的英文：
mutual interest

mutual是什么意思：
adj. 相互的，彼此的；共同的

They have a mutual dislike of each other.
他们都不喜欢对方。

We were introduced by a mutual friend.
我们一个共同的朋友介绍我们认识了。

The same should be true of mutual concessions.
互让也是如此。

The country agreed to confederate with the neighboring country for mutual safety.
这个国家同意为了共同的安全而与邻国结盟。

It is necessary for men to enter into a compact mutually among themselves
人们之间有必要共同缔结一种契约。

interest是什么意思：
n. 兴趣；趣味；利息；利益；产权；利害关系；行业；势力
v. 使感兴趣；使参与

Interest will not lie.
兴趣不会说谎。

He had both fractional interests and majority interests.
他兼有零星的股权和大宗股权。

He had both fractional interests and majority interests
他兼有零星的股权和大宗股权。

His interesting lecture revived my interests in volcanology.
他那个有意思的讲座重新燃起我对火山学的兴趣。

coordinate immediate interests with long-term interests.
调和目前的利益和远期利益。