foredawn; 拂晓
In spring, one sleeps and wakes up to find it is already day. 春眠不觉晓。
known to each and every family; 家喻户晓
There's not a person who doesn't know. 谁个不知,哪个不晓?
make known; announce 揭晓
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)