at the crack of dawn

at the crack of dawn是什么意思？at the crack of dawn怎么读？老师板报英语词典为用户提供单词at the crack of dawn的释义、at the crack of dawn的音标和发音、at the crack of dawn的用法、例句、词组、词汇搭配、近反义词等内容，帮助大家掌握单词at the crack of dawn。

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