Google：冰凍三尺非一日之寒比喻一種情況的形成，是經過長時間的積累、醞釀的。

來源: 於 2012-11-04 12:40:16 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

It takes more than one cold day for the river to freeze three feet deep;The trouble has been brewing for quite some time. Rome was not built in a day.

Rome was not built in a day
Prov. It takes a lot of time to achieve something important. Professor: When will you finish your research project? Student: It'll take me a while. Rome wasn't built in a day, you know.