They reached the town before it got dark.

天未黑前他们就到了镇上。

youdao

We needed to cover another 30 miles before it got dark.

天黑以前我们需要再走30英里。

youdao

As it grew dark, the boy realized how tired he was and he got up to leave, but before he had gone more than a few steps, he turned around, ran back to the old woman and gave her a hug.

天色晚了，男孩觉得累了，于是起身离开。但是没走几步，他又转过身来，跑回到老婆婆的面前给了她一个拥抱。

youdao

Hilda proposed that they take a walk right away, before it got dark.

NEWYORKER: She��s the One

Liz would ride her bike up and down the driveway, waiting for her father to call her, to tell her to come quick, to come see the misshapen gourd, or the earthworm, or the potato bug before it got too dark, and she would, before it went black as pitch.

NEWYORKER: Playdate