即夜晚降临，黄昏。

1. I started work at dawn and returned only at nightfall.

我披星戴月地工作。

2. I need to get to Lyon by nightfall.

我需要在黄昏前到达里昂。

3. The company was not attempting to run cars after nightfall.

公司天黑之后就不再出车.

4. At nightfall, he returned to the rickshaw yard dead - beat and preoccupied.

晚上, 他回到车厂,身上已极疲乏,但是还不肯忘了这件事.

5. They were trying to make New Orleans by nightfall.

他们力图在黄昏前赶到新奥尔良。