Create good reciprocal relationships, and avoid people who benefit at your expense.

建立良好的互惠关系，避开那些从你的损失中获益的人。

Of these 1500, there will be 150 who you have a fairly good reciprocal relationship with.

在这 1500 人中，有 150 人与你有较好的互惠关系。

But we use this expression to mean a reciprocal relationship.

但是我们用这个表达来表示互惠关系。