Ground observers described a bright artificial cloud resembling a cone or fan that soon faded out within a few minutes.

地面观察者形容说这片明亮的人造云像锥形物或是伞状物一样聚集，并且在几分钟内消逝。

youdao

Pressure created by sound waves squeezes moisture from the air, creating the "artificial cloud."

声波产生的压强将空气中的水分挤压出来，形成“人造云”。

youdao

Pressure created by sound waves squeezes moisture from the air, creating the "artificial cloud."

声波产生的压强将空气中的水分挤压出来，形成“人造云”。

youdao