He could turn off a light and then jump into his bed before the room got dark.

VOA: special.2009.01.24

First,they don't meet in the daytime; they meet either early before light,at dawn, or after dark,at night.

首先，他们不在白天聚会;,要么在天亮前的黎明，要么在天黑后的夜晚。

耶鲁公开课 - 新约课程节选

Maybe you should leave before it gets too dark, so that you don't have to walk too far.

也许你该在天黑之前就动身回去了，这样你就不用走那么远了。

How long实战 - SpeakingMax英语口语达人

But before it is dark, you see a large movement of gray bodies.

VOA: special.2009.08.19