at dawn
天刚亮南希就醒了。
Nancy woke at dawn.
《柯林斯英汉双解大词典》
天刚亮，他睁开眼睛，就听见有人在敲门。
At dawn he opened his eyes just as a loud knocking sounded at the door.
youdao
天刚亮他就睡着了。
He dropped asleep as the dawn appeared.
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