The sky was full of dark masses of clouds.
天空中乌云密布。
The wind swept away the masses of clouds.
风把大片的云吹走了。
In the western sky, there were great masses of clouds.
西部天空中有大块的云团。
There is wind everyday in this summer, and there are masses of clouds floating in the sky.
这个夏天每天都有风，并且有大片的云彩飘来飘去。
Thus, masses of harmful acid clouds float everywhere causing violent chain reactions to break out.
因此，大团大团的有害酸云到处漂浮，引起猛烈的连锁反应的爆发。
Masses of dark clouds melted away.
大块大块的乌云消散了。
Where these air masses meet, a narrow zone of storm clouds develops, and thunder storms and sometimes tornadoes occur.
在这些气团相遇的地方，暴风云的狭窄区域形成了，雷雨，有时是龙卷风便出现了。
Cumulus clouds are big, white masses of fair-weather clouds that drift across the daytime sky. But heavy layers of cumulus clouds can threaten rain. (4)
积云是白色的、标志着好天气的大云团，在白日的天空中飘浮。但是，厚厚的积云层可能是要下雨的征兆。
Before the rain, there were masses of dark clouds in the sky.
下雨前，天空有大片大片的乌云。
Before the rain, there were masses of dark clouds in the sky.
下雨前，天空有大片大片的乌云。
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