拆除现场升起的一团厚厚灰尘覆盖了整个区域。

A thick ___cloud of dust from the demolition site covered the entire area.

工厂排放出一团浓密的烟雾，危害环境。

The factory emits a dense ___cloud of smoke that harms the environment.

爆炸后，一团巨大的碎片云充满了空气。

After the explosion, a giant ___cloud of debris filled the air.