夜幕降临之前，冰层碎裂了，我们的船自由了。

Before night the ice broke and freed our ship.

youdao

石头将会粉碎，沙子将会被染红，敌人的城堡会在夜幕降临之前陷落。

Stone will crumble the desert will run red. Our enemy$ s stronghold will fall before nightfall .

youdao

我们的船起航后一路猛跑，抓住了许多有利于航行的好机会，因为我们想在下一个夜幕降临之前尽快离开这段河流(就像要离开去开罗那样)。

We went booming along, taking a good many chances, for we were anxious to 'get out of the river' (as getting out to Cairo was called) before night should overtake us.

youdao