There will be heavy clouds over many areas tomorrow.
明天很多地区将会有多云的天气。
I thought it would rain. There were heavy clouds this morning.
我还以为要下雨呢，早上有很多乌云的呀。
Heavy clouds are the forerunners of a storm.
阴云密布是暴风雨的前兆。
Heavy clouds rose slowly from the horizon; thunder drummed in the distance.
浓云从地平线缓缓升起，远处雷声隆隆。
Heavy clouds rose slowly from the horizon; thunder drummed in the distance.
浓云从地平线缓缓升起，远处雷声隆隆。
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