Scientists have previously1 found signs of ice on the Moon and water vapour in its thin atmosphere.

Water vapour condenses to form clouds

水蒸气凝结形成云。

The air near the surface of the earth is warmer than that which is higher up, so when the water-vapour rises very high above the ground, it is cooled.

靠近地球表面的空气温度比高空的空气温度要高一些，因此，当水蒸气漂浮到高空时就会被冷却。

So the water-vapour is first changed into those very tiny specks of liquid water which have been called water-dust, and appears as clouds; and then these specks of water join together to form drops of rain.

因此，水蒸气首先变成了非常细小的水粒——也就是我们所说的水雾——并构成了云朵，然后这些水粒汇聚在一起成为了雨滴。

We have learned that when water-vapour is cooled it is condensed.

我们知道，水蒸气遇冷之后就会产生冷凝。

Intrinsic kinetics of methane steam reforming over a Ni/ α Al_2O_3 catalyst

Ni/αAl2O3催化剂上甲烷水蒸气重整本征动力学

So when this vapour is changed back into water again, it forms pure fresh water.

因此，当水蒸气再次变成水滴的时候，淡水应运而生。

"And whether you're a river or vapor, your nature never changes."

"不管你是河流还是水蒸气,你的本性永远不会改变。"

Steam, water and ice constitute the three phases of the same matter.

水蒸气、水和冰是同一物质的三个相态。

Indicates that China Railways has already grasped the core technology for trains that operate at speeds over 200 kmh

标志着中国铁路已经掌握了时速200公里及以上动车组核心技术

She suggests downloading the Instant or Moment apps to see how many times you turn on your phone each day.

她建议人们下载Instant或Moment等应用程序来记录自己每天打开于机的次数。

So the voice actors are pushing for the idea of secondary compensation — a performance bonus every time a game sells 2 million copies or downloads, or reaches 2 million subscribers, with a cap at 8 million.

因此，配音演员们有了获得二次补偿的想法——每当一款游戏卖出200万份游戏包或下载量，或者拥有200万订阅时，即获得一笔业绩奖金，上限为800万。

They worry that students might use iPads to download teaching notes and use them to cheat during exams.

他们担心学生可能会用ipad下载教学笔记,并在考试时用它们作弊。

You may download such pictures to your computer or smart phone.

你可以把这些图片下载到你的电脑或智能手机上。

Download the PowerPoint if your teacher puts it on QQ.

如果你的老师把幻灯片放在QQ上,请下载。

It has been downloaded 5,700 times.

而且已经被下载过5700多次了。

You can download the file and edit it on your word processor.

你可以把文件下载，用文字处理系统做编辑。

The concept of jailbreaking is most often associated with products from Apple Inc., such as the iPhone, iPod and iPad, which routinely restrict the user to applications licensed on what kinds of applications they can purchase,

“越狱”这个说法多与苹果公司的iPhone、iPod以及iPad等产品有关，因为苹果产品都要求用户只能从苹果的专属商店下载和购买应用程序。

New stereos pull in satellite radio broadcasts and play MP3 files downloaded from the Internet.

新装的音响可以播放卫星广播和从网上下载的MP3文件。

The most successful sharers — those whose data are downloaded and cited the most often---get noticed, and their work gets used.

最成功的分享者们——他们的教据被頻繁的下载和引用——获得关注，而且其著作也常被引用。

Any organization can downlink the program without charge.

任何机构都可以免费下载这一节目。