at the crack of dawn

基本解释

And inasmuch as I had to be in midtown at the crack of dawn for a CNN hit, I figured today was the day.
正好，早上我要去市中心做一个CNN的采访，择日不如撞日，今天我就杀奔苹果店了。
He gets up at the crack of dawn to do a couple of hours’ extra ploughing. He even refuses to take a day off when he splits his hoof.
他每天天刚亮就起床，以便能多耕几小时的地，甚至在马蹄撕裂的情况下，他都拒绝休假一天。
One week later, I lived in the den of my grandparents' apartment, got up at the crack of dawn and worked in a place where I was so intimidated that I didn't get up to go to the bathroom.
而毕业一个星期后，我搬到祖父母公寓的一个小房间里，天刚擦亮就起床，工作的时候吓得都不敢站起来去上厕所。

Boston this afternoon for the EnergySMART 2012 Conference, which kicks off tomorrow at the crack of dawn.
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