Definition: a white or grey mass in the sky, made of very small drops of water Level: A2
天空出现了一大片云。
A huge ___cloud appeared in the sky.
看！那朵云看起来像一只兔子。
Look! That ___cloud looks like a rabbit.
地平线上那些乌云可能会带来降雨。
Those dark ___clouds on the horizon might bring rain.
