They cast anchor at nightfall.

他们傍晚抛锚停泊。

《牛津词典》

Just at nightfall, when hope was about gone, I was picked up by a small ship which was bound tor London.

就在夜幕降临，希望即将破灭时，一艘开往伦敦的小船搭救了我。

youdao

You can see the star at nightfall.

黄昏时你能看到那颗星星。

youdao

At nightfall, the helicopters, bearing teams of operators, lifted off from bases around Iraq and Afghanistan.

FORBES: General Stanley McChrystal: Leadership Lessons From Afghanistan

Botanists and gardeners run guided tours, and at nightfall visitors can watch an elaborate firework display over the Italian garden.

BBC: Green-fingered gatherings in Berlin

The bridge -- made up of segments linked together -- is partially disassembled at nightfall and put together in the morning.

CNN: Bosnia begins peaceful 1996