交友莫交财，交财两不来.
Never make friends for money； it will lead to nothing but trouble.
路遥知马力，日久见人心.
True colors are revealed over time； a good friend will stand the test of time.
读书如交友，应求少而精.
Reading is like making friends； choose few but high-quality ones.
失友快，交友慢.
It's easy to lose friends but hard to gain new ones.
A life without a friend is a life without a sun.
Life without friends is like a life without sunshine.
A man who has friends must show himself friendly.
One must be friendly to have friends.
A true friend is one soul in two bodies.
A true friend is like two bodies sharing one soul.
Friendship with a man is friendship with his virtue.
To be friends with a man is to be friends with his virtues.
Between friends all is common.
Friends share everything.
A friend to all is a friend to none.
A person who is a friend to everyone is not a friend to anyone.
岁寒知松柏；患难见交情.
True friendship is revealed in times of adversity.
二人同心，其利断金.
When two people are united, their strength is unstoppable.
朋友千人尚觉少，仇敌一人犹嫌多.
A thousand friends are few, but one enemy is too many.
脚长沾露水，嘴长惹是非.
Be careful of the company you keep； loose lips sink ships.
这些谚语不仅简单易懂，而且包含了深刻的道理，可以帮助七年级的学生更好地理解友谊和交友的重要性。建议在日常学习和生活中多加体会和应用这些谚语。