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1·The storm clouds were gathering.

暴风雨乌云正在聚集。《牛津词典》

2·Storm clouds are forming on the horizon.

天边出现了暴雨云。《牛津词典》

3·The storm clouds of revolution were gathering.

乌云滚滚，山雨欲来，革命即将爆发。《牛津词典》

4·The storm clouds disappeared.

乌云消失了。

5·Vimala saw storm clouds climbing up to Miss Lee's face.

维玛拉看到暴风雨的乌云爬上了李小姐的脸。

6·Sounds bounce off heavy storm clouds and return to earth with increased force.

声音从暴风云中反弹回来，并带着更大的力量返回地球。

7·The idea of forcing storm clouds to discharge their lightning on command is not new.

迫使雷雨云应要求放出闪电的想法并不新鲜。

8·Over the past three weeks, the storm clouds have gathered again over the government.

在过去三周里，不祥的阴云再次笼罩了政府。《柯林斯英汉双解大词典》

9·With luck, as the storm clouds gather this winter, laser-toting researchers could, for the first time, strike back.

幸运的是，当今年冬天风暴云聚集的时候，携带激光的研究人员可以首次进行反击。

10·Look up and see dark storm clouds.

抬头看见阴云密布。