He took the food eagerly, for he had eaten nothing since dawn.

他急切地取食物，因为从黎明开始，他一直没吃东西。

youdao

He took the food eagerly, for he has eaten nothing since dawn.

他狼吞虎咽地吃了起来，因为他从天亮就没吃过东西。

youdao

They knew the move had to be made quickly, however, since dawn was only four hours away.

他们知道自己必须尽快行动，因为离日出只剩下四个小时了。

youdao

People have asked these questions since the dawn of humanity, but the answers have kept changing.

ECONOMIST: The universe

Now is when Tsukiji's natural day ends, and I have been here since before dawn.

ECONOMIST: Gems of the ocean

Engineers have been puzzling over how to make better electricity storing devices since the dawn of electricity.

FORBES: A123 Bites the Dust Because They Forgot Their ABCs