People can be divided into these types: strangers, acquaintances, familiar people, friends, and close friends. True friendship isn't about compliments to your face, but whether you're mentioned when they talk about friends behind your back.
人分這么幾種：不認(rèn)識，認(rèn)識，熟人，朋友，知心朋友。朋友不在當(dāng)面表白，而是背后說起朋友的時候，是否提到過你。
The human mind is a complex and fascinating subject, and understanding it requires both scientific rigor and a touch of creativity.