交友莫交财，交财两不来。

never make friends, never make money.

路遥知马力，日久见人心。

lu yaoyao knows horsepower, and he sees people's hearts and minds for a long time.

读书如交友，应求少而精。

reading, like making friends, requires less and more refinement.

失友快，交友慢。

quick to lose friends, slow to make friends.

好朋友不分彼此。

Between friends all is common.

物以类聚，人以群分。

Birds of a feather flock together.

患难见真情。

A friend in need is a friend indeed.

人生没有朋友，犹如生活无太阳。

A life without a friend is a life without a sun.

选择朋友要审慎，摒弃更要审又慎。

Be slow in choosing a friend； slower in changing.

朋友乃第二个自我。

A friend is a second self.

这些谚语简单易懂，既适合七年级学生理解，也能帮助他们更好地理解友谊和交友的原则。