- a visible mass of condensed watery vapour floating in the atmosphere, typically high above the general level of the ground云：
the sun had disappeared behind a cloud
太阳被云遮住
mass noun the sky was almost free of cloud.天空几乎万里无云。
- an indistinct or billowing mass, especially of smoke or dust朦胧物; 滚滚浪状物（尤指烟、尘）：
a cloud of dust.
滚滚尘土。
- a large number of insects or birds moving together掠过的一大群（昆虫或鸟）：
clouds of orange butterflies.
一群群橙色的蝴蝶。
- a vague patch of colour in or on a liquid or transparent surface（液体、透明表面的）阴影, 模糊色。
- figurative used to refer to a state or cause of gloom, suspicion, trouble, or worry〈喻〉阴影; 疑团; 麻烦; 忧虑：
the only cloud on the immediate horizon is raising a mortgage
眼前惟一的麻烦就是筹措抵押贷款
a black cloud hung over their lives.
一片阴影笼罩他们的生活。
- a frowning or depressed look皱眉; 沮丧的表情：
a cloud passed over Jessica's face.
杰西卡的脸上掠过一丝沮丧的表情。
- no obj.(of the sky) become overcast or gloomy（天空）云层密布; 转阴：
the blue skies clouded over abruptly.
蓝天突然云层密布。
- with obj.（一般作be clouded）darken (the sky) with cloud使（天空）布满云层而阴暗下来：
the western sky was still clouded.
西边的天空仍然漫天云层。
- make or become less clear or transparent（使）变模糊：
with obj. blood pumped out, clouding the water鲜血涌出, 染红了水
no obj. her eyes clouded with tears.她泪水模糊了双眼。
- figurative make or become darkened or overshadowed, in particular〈喻〉（使）变暗; （使）变模糊, 尤指：
- no obj.(of someone's face or eyes) show worry, sorrow, or anger（面部, 眼睛）显现忧虑（悲伤或愤怒）：
his expression clouded over.
他一脸愤怒。
- with obj.(of such an emotion) show in (someone's face)（忧虑, 悲伤, 愤怒）显现于（面部）：
suspicion clouded her face.
她一脸怀疑。
- with obj. make (a matter or mental process) unclear or uncertain; confuse使（事件, 心理过程）模糊; 使迷惑：
don't allow your personal feelings to cloud your judgement.
别放任你的个人感情让你判断不清。
- with obj. spoil or mar (something)毁坏, 损坏：
the general election was clouded by violence.
大选被暴力事件破坏了。
every cloud has a silver lining
- 见SILVER.
in the clouds
- out of touch with reality与世隔绝：
this clergyman was in the clouds.
这名教士与世隔绝。
on cloud nine（或seven）
- extremely happy欣喜若狂, 快乐至极。
- ORIGIN: with reference to a ten-part classification of clouds in which 'nine' was next to the highest.
under a cloud
- under suspicion; discredited遭嫌疑; 受怀疑：
he left under something of a cloud, accused of misappropriating funds.
他走了, 遭到几分怀疑, 被指控盗用基金。
with one's head in the clouds
- (of a person) out of touch with reality; daydreaming（人）与现实隔绝; 白日做梦。