The wind swept away the masses of clouds.

风把大片的云吹走了。

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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。

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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。

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Masses of dark clouds melted away.

大块大块的乌云消散了。

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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。

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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。

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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。

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