When the sky suddenly turns dark and the wind is strong, watch out! A dangerous storm might be coming.

当天色突然变黑且狂风大作的时候，要小心！一场危险的暴风雨可能要来了。

youdao

The sky suddenly went dark and it started to rain.

天空骤然转暗，随即下起雨来。

《牛津词典》

Suddenly, the headlights from another car appeared in the dark.

突然，另一辆车的前灯出现在黑暗中。

youdao

Suddenly Sylvie's dark gray eyes caught a flash of white that grew larger and larger.

VOA: special.2010.04.03

Suddenly the sky turned dark.

VOA: special.2009.02.28

The control car was suddenly dark as cloud engulfed us.

NPR: Excerpt: 'Skybreaker'

Myanmar-based blogs went dark suddenly.

CNN: Internet cut in Myanmar, blogger presses on

Tania wasn't killed suddenly that night on a dark country lane.

BBC: [an error occurred while processing this directive]