乌云；黑云；暗云

dark colour───深色

Oort cloud───奥尔特云

ash cloud───尘云；灰云

bark cloth───树皮布

dark hour───黑暗时刻

dark mood───阴暗的心情

dark wood───阴暗森林（游戏名，Darkwood）；漆黑的树林

dust cloud───尘埃云；[天]尘云；尘雾

rain cloud───n.[气象]雨云

Rain comes after sunshine, and after a dark cloud, a clear sky.───晴日之后有雨水, 乌云过去见青天.

The dark cloud over downtown is now more a foggy mist.───市区上空的乌云现在比薄雾要浓了.

Every dark cloud has a silver lining.───天阴总有天晴时.

dark cloud passed over the sky.───乌云从天上掠过。

If the dark cloud clears off, we'll go th the park.───如果天色转晴, 我们就到公园去.

It will probably rain because there is a dark cloud approaching.───天可能要下雨,因为飘来了乌云. (表直接理由)

Rain comes after, and after a dark cloud, a clear sky.───晴日之后有雨水, 乌云过往见青天.

A mother's smile is like the sunshine breaking through a dark cloud.───母亲的微笑就像穿透乌云的阳光.

The only dark cloud on the horizon was that they might have to move house.───唯一的忧虑是他们可能要搬家。

A dark cloud of bees comes swarming out of the hive.───黑压压的一大群蜜蜂从那座蜂巢涌过来。

A dark cloud of bees comes swarming out of the hive.───黑压压的一大群蜜蜂从蜂巢中飞出来。

A dark cloud loomed up over the horizon.───一片乌云突然出现在天际.

A dark cloud passed over the sky.───一朵乌云从天上掠过.

The top of the mountain was covered with a dark cloud, which took shine off the front view of the mountain.───一片乌云遮住山顶, 使山前的景物黯然失色.

Her colour came up, a heavy rage came over her like a dark cloud.───一股怒火象乌云一般涌上心头.她满脸通红.

It can cast a dark cloud over these forums.───它将是的论坛上空布满乌云.

This is dark cloud outside the silver lining of increasing longevity.───这是笼罩在长寿之光外的乌云.

During collapse, the dark cloud " fragments " into a series of dense clumps.───在坍缩过程中, 暗云 “ 碎裂 ” 为一批稠密的团块.

A dark cloud descended upon the valley.

Rain comes after sunshine, and after a dark cloud, a clear sky. 

The only dark cloud on the horizon was that they might have to move house.

A dark cloud loomed up over the horizon.

This mass of dark cloud is raining.

A dark cloud suddenly blotted out the sun.

It's like a dark cloud continually hovering over us.

A dark cloud of bees comes swarming out of the hive.

A dark cloud floated across the moon.