表达 at the crack1 of dawn 的意思是 一天开始的时候,也被用来表示 天一亮、一大早就发生了某件事情。名词 dawn 指 日出的时候,黎明。

例句

Im so tired today. I had to get up at the crack of dawn to avoid too many people on the train.

我今天累坏了。为了防止和太多人一块挤火车,我不能不天一亮就起床。

We left at the crack of dawn so we could get to my grandmas house on time for breakfast.

大家一大早就出发了,以便能按时到奶奶家吃早饭。

We start work early, so we have to get up at the crack of dawn.

大家非常早就开工,所以需要天亮时就起床。