cloud基本解释

n,[气象]云；阴云；云状物；一大群；黑斑,同近

Fears of renewed terrorist attacks cast a cloud over the event (= spoilt the happy situation ) ..对恐怖分子再次发动袭击的担心给这次活动蒙上了一层阴影。

云；阴云；云状物；一大群；黑斑英释nna white or grey mass in the sky that forms from very small drops of water

in the clouds,心不在焉；在云层中.短语