朋友都是有共通点的 (物以类聚)。
The reason why men enter into society is the preservation of their property.
在热闹繁华中如果能够保持理性,才不至于迷失,也就省去了许多徒慕虚荣的苦心;困境中,在人生的低谷期,若能保持一份乐观,才会有一番更为真切的人生感悟。
The lightning that precedes the thunder is a common image of the warnings that come before calamity.