The sky is dark 天黑黑
the sky is getting dark 天空开始变的昏暗 ; 天空变得黑了
The Sky Is Turning Dark 天乌乌
The dark sky is drooping 黑黑的天空低垂
The sky is dark.
天空是黑暗的。
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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 is turning dark.
天渐渐暗了。
The sky is overcast with dark clouds.
乌云满天。
《新英汉大辞典》
The other half of the sky is 97% dark.
FORBES: Advertising's Biggest Problem: The 'Other Half Of The Sky' Is 97% Dark
Entering the home from the building's dark hallway is like stepping into the sky.
WSJ: Sailing the Wide Miami Sky
The criteria for a dark sky site includes that the Milky Way is visible to the naked eye.
BBC: Stargazing live: Astronomers stage Isle of Man events
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