cau = to take care

來自拉丁語的cau 意爲(wèi)to take care。

1.precaution（事先小心或注意pre(=before) + cau(=take care)）
n.謹(jǐn)慎；警惕；預(yù)防
precautionary adj.警惕的；預(yù)防的
As a precaution ,please fasten your seat belt before starting the car.作爲(wèi)一種預(yù)防措施，請?jiān)诎l(fā)動(dòng)車之前系好安帶。

2.caution
n.小心，慎重；警告；（外貌、行動(dòng)或言語等）令人發(fā)笑的 v.使某人小心；警告
cautionary adj.警告的；告誡的
cautionary tales 警世故事
We were cautioned not to drive fast.我們被警告不能開快車。

3.cautious
adj.謹(jǐn)慎的，小心的
cautiously adv.謹(jǐn)慎地，小心地
cautious about giving offense 唯恐讓對方生氣而小心翼翼的