1.
The storm clouds had dispersed by noon.
正午前暴风云已消散
2.
storm-cloud (large black cloud coming with a storm or indicating that a storm is likely to happen )
暴风云（暴风雨时出现的或预示暴风雨将至的浓密的乌云）.
3.
Black clouds portend a storm.
乌云为暴风雨的前兆。
4.
Black clouds threaten a storm.
乌云是暴风雨的先兆。
5.
Dark clouds denote that a storm is coming.
黑云表明风暴要来临。
6.
The dark clouds threatened a big storm.
乌云预示暴风雨的来临。
7.
Black clouds that portend a storm.
预示着风暴到来的乌云
8.
Epidemic analysis on a rubella outbreak in Yunlong county of Yunnan province,2008
2008年云南省云龙县暴发风疹疫情分析
9.
angry clouds on the horizon; furious winds; the raging sea.
地平线上狂暴的乌云；狂暴的风；狂暴的大海。
10.
A tornado is a rotating column of air from a thunderstorm to the ground.
龙卷风是雷暴云层伸向地面的旋转的云柱。
11.
These black clouds forebode a violent storm.
这些乌云预示着狂风暴雨即将到来。
12.
Angry clouds on the horizon.
地平线上预示暴风雨的云
13.
Gathering clouds announced the oncoming storm.
密集的云预示着暴风雨的来临。
14.
Dark clouds betoken a storm.
乌云予示着暴风雨的来临。
15.
The lowering clouds presage a storm.
暗云低沉是暴风雨的前兆。
16.
lowering storm-clouds covered the sky;
孕育着风暴的黑云低垂，布满天空；
17.
The banks of dark clouds promised a heavy storm.
一块块乌云预示着大风暴的来临。
18.
a heavy dark cloud presaging rain or a storm.
预兆雨或暴风雨的沉重的黑云。