狡兔三窟　

◎ 狡兔三窟 jiǎotù-sānkū

[a wily rabbit has three burrows-elaborate precautions made for self-protection] 狡黠的野兔筑巢时备有相通的三个洞窟。比喻为将来躲避灾祸计虑得十分周密