The upper clouds can circle the planet in four days or even less, and no one knows why.
高空云能在四天或更少时间里环绕卫星一周，没人知道为什么。
Precipitation from warm front rainbands often involves "seeding" by ice particles falling from the upper clouds layers.
暖锋雨带的降水经常随着来自上层云层“散布”的冰粒。
The TC4 project will generate new data on the icy cirrus clouds that are formed in the upper atmosphere by heat-driven, or convective, storm systems that coalesce over warm waters in the tropics.
TC4工程将研究出关于含冰卷云的各种资料，这种云层是在大气上层中通过受热量驱使或对流的暴风雨变化过程中形成的，而此暴风雨也是与热带暖水海洋上空的状况密切相关。
THE comings and goings of noctilucent or "night shining" clouds in the extreme upper atmosphere may be linked to the sun's rotation.
高层大气中时隐时现的发光的云团可能跟太阳的自转有关。
Airship passengers can enjoy an indoor view of the clouds beneath their feet in the moon pool, or go to the upper deck promenade for an open-air excursion.
飞艇内的乘客可以通过他们脚下的月亮池在室内享受云层景观，同时，到上层长廊享受一下露天景观也是不错的选择。
At times he disappeared from view as clouds whipped past the top of the tower enveloping the upper levels.
有几次他在人们的视野中消失了，原来有云朵突然飘过塔楼顶端，遮住了大楼上端。
The clouds exhibit thin, wispy light blue forms that contrast with the darkness of space (image upper right).
云层稀薄而纤细，并泛着蓝光，和无尽的黑暗太空形成对比(右上部分)。
The clouds are nothing but fogs in the upper regions of the atmosphere; fog itself is nothing but a cloud immediately over ground.
其实，云跟雾是一样的东西，可以认为，所谓云，就是升到大气层高处的雾，而当云的高度降到地面的时候，就成了雾。
Panel (a) True color composite of one MODIS granule showing Marine stratocumulus clouds with ship tracks as well as upper-level ice clouds.
a组的由MODIS卫星拍摄复合而成的真彩图，颗粒状和船舶形层积云曲目以及海洋上层冰云。
Astronomers estimating the apparent age of the ring to be around 5, 000 years, also find more distant gas clouds perpendicular to the ring plane, seen here at the upper left and lower right.
天文学家推测该环的表面年龄大约在5000年左右，还发现垂直于该环形行星有着距离更远的气体云，图中就是左上和右下的部分。
Pictured above, the face of a full moon is partly blocked by Earth's clouds, and partly darkened on the upper right by Earth's umbral shadow.
上图中，月亮被云遮去了一小部分，但是右上角的暗影并不是云造成的，那是地球的影子。
This water vapor (a gas), being lighter than air, rises until it reaches the cold upper air where it condenses into clouds.
这些水蒸气(一种气体)由于比空气轻，会上升直至达到高空冷气层，并在那里凝结成云。
This water vapor (a gas), being lighter than air, rises until it reaches the cold upper air where it condenses into clouds.
这些水蒸气(一种气体)由于比空气轻，会上升直至达到高空冷气层，并在那里凝结成云。
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