您要查找的是不是：
- Dark clouds are a sign of rain or snow. 乌云是雨或雪将至的预兆。
- There were masses of dark clouds in the sky. 天上有朵朵乌云。
- The banks of dark cloud promised rain. 天上片片乌云，就要下雨了。
- There are dark clouds in the sky. 天空乌云密布。
- The moon peered from behind dark clouds. 月亮在浓云后面若隐若现
- The dark clouds suggest an impending storm. 乌云表明暴风雨即将来临。
- The sky became suddenly covered with dark clouds. 天空突然变得乌云密布。
- Dark clouds massed, and we expected rain. 乌云密布，我们预料要下雨了。
- Dark clouds were gathering in the sky. Heavy rain would come soon. 乌云密布，大雨就要来临。
- The moon was obscured by dark clouds. 月亮被乌云遮住了。
- For a time rolling dark clouds hung over China. 一时，中国上空乌云翻滚。
- Dark clouds gloomed the streets. 乌云使大街上阴沉沉地。
- Dark clouds massed, and I expected rain. 乌云密布，我预计要下雨。
- Dark clouds capped the high mountains. 乌云遮盖着高山。
- Dark clouds denote a coming storm. 黑云表明风暴要来临。
- The sky was canopied with dark clouds. 天空乌云密布。
- Those dark clouds foreshadow a storm. 那些乌云预示着有一场暴风雨。
- The moon retired from view behind dark clouds. 月亮隐没在乌云后面看不见了。
- The dark clouds announced the coming his return. 乌云是风雨欲来的前兆。
- The dark clouds finally dissipated. 乌云最后消散了
