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.