Definition: a mass of something such as dust or smoke that looks like a cloud Level: B2
一团厚厚的尘土从建筑工地升起。
A thick ___cloud of dust rose from the construction site.
工厂每天早晨排放出一团黑色的污染云。
The factory emits a dark ___cloud of pollution every morning.
爆炸后，一团巨大的碎片云充满了空气。
After the explosion, a massive ___cloud of debris filled the air.
