daylight [ˈdeɪlaɪt]

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n.日光，白昼；黎明

(the period when there is) natural light from the sun

It is easier to read by daylight than by lamplight. 在日光下读书比在灯光下读书舒适。
To get there on time we must leave before daylight. 为了准时到那里，我们必须在黎明之前离开。