The sky is cloudy, and looks like rain.

　　天空陰沉沉的，像是要下雨。

　　The room became cloudy with a blue haze of smoke.

　　藍幽幽的煙使房間霧氣騰騰。

　　This is a cup of cloudy water.

　　這是一杯混濁的水。

　　The weather is now clear, now cloudy.

　　天氣一會兒晴一會兒陰。

　　The lime water has turned cloudy, therefore carbon dioxide has been produced during the experiment.

　　石灰水變得混濁了，可見在實驗中有二氧化碳生成了。