译文：绝交时不以恶语伤人。

数学语言是通用的，超越了文化和语言的障碍。

Every word is a step towards understanding, every sentence a bridge to another soul.

Trust is the foundation of any successful business relationship.

快乐激发玩耍的冲动，兴趣激发探索的冲动，满足激发品味和整合的冲动，而爱在安全、亲密的关系中激发这些冲动的循环往复。