最该防的不是外人，而是你身边的同事、闺蜜、朋友。世上没有谁会从背后向陌生人捅刀子，背后捅刀子的都是毫无防备的熟人，因为只有他才知道刀子往哪扎得对。

What you should guard against most are not strangers, but the colleagues, close friends, and companions around you. No one in this world would stab a stranger in the back from behind. Those who do so are always unsuspecting acquaintances — because only they know exactly where to strike.