如果地球上没有水怎么办？
如果车厢里没有空间，我可以坐在车辕上。
If there's no room inside, I can sit on the top of the coach.
如果你上的是当地的大学，尤其是没有宿舍的，你可能会住在家里然后通勤去上课。
If you are attending a local college, especially one without residence halls, you'll probably live at home and commute to classes.
“你会有一门很棒的课程，但是如果没有用心的老师上这门课的话，”她说，“这节课教会你的不会如你想象中多。”
"You can have a great curriculum but if you don't have teachers dedicated to teaching it well," she says, "it won't work as well as you want it to."
如果平板电脑用户在网络浏览器上就可以免费阅读新闻，那么这样做就没有什么意义了。
There is little point doing that if a tablet user can simply read the news for free on a web browser.
同样，如果一种植物或动物没有留下任何可以繁殖的后代，它就不能把所有的能量浪费在使自己变得更强壮上，因为这是最可能走向灭绝的方式。
Similarly, a plant or animal cannot squander all its energy on growing a big body if none would be left over for reproduction, for this is the surest way to extinction.
如果我们把世界上的自然资源都用光了，那么就没有什么东西可以留给我们的下一代了。
If we use up all the world's natural resources, nothing will be left for our future generation.
事实上，如果记者对加拿大宪法的基本特征没有清晰的把握，他们很难胜任报道政治事件的工作。
In fact, it is difficult to see how journalists who do not have a clear grasp of the basic features of the Canadian Constitution can do a competent job on political stories.
说没有简单的答案听起来很明智，但实际上是愚蠢的：如果我们有清醒的理智和政治意愿来采取行动的话，我们的失业危机可以很快得到解决。
Saying that there're no easy answers sounds wise, but it's actually foolish: our unemployment crisis could be cured very quickly if we had the intellectual clarity and political will to act.
没有人要你放弃自己喜欢的活动，但如果在电视上看到美食节目的话，你可以试着自己做节目上的菜。
No one is asking you to give up activities you like, but if you're watching food shows on TV, try cooking instead.
我是说，如果你上法院，奴隶当然不能在法庭上代表自己。他们没有任何法律地位。
I mean when you go to court, slaves, of course, can't represent themselves in court at all. They don't have any legal standing.
如果一个罐子没有底部，或者在它的侧面有很大的开口，那么它就很难被认为是传统意义上的容器。
If a pot has no bottom or has large openings in its sides, it could hardly be considered a container in any traditional sense.
电视上什么都没有，我觉得无聊，就摸了摸架子上的蜡烛……我有了个主意！如果我把厨房纸点着了会怎样？
Nothing was on TV, so I felt bored and touched the candles on the shelf…I had an idea! What would happen if I set fire to some kitchen paper?
如果早期的太阳比现在的太阳暗淡，也没有现在这么炙热的话，那么液态水就不可能在这两个星球上存在。
If the young Sun was much fainter and cooler than the Sun today, liquid water couldn't have existed on either planet.
如果没有化学，我们永远不会知道我们需要肥皂来去除衣服上的油污。
Without chemistry, we would never have known that we need soap to get the oil out of clothes.
如果我们在某些事情上从未失败过，那么我们可能还没有学会生活教给我们的所有东西。
If we never fail at something, we probably haven't learned all that life has to teach us.
如果你的家庭作业涉及到上网，而你没有自己的电脑，那么一定要在家庭电脑上“预定”一些时间，或者可以在学校图书馆使用一台。
If your homework involves going online and you don't have your own computer, make sure you "book" some time on the family computer, or can use one in your school library.
如果没有，那就回到正轨上吧，不是明天，不是下周。
If not, get back on track today, not tomorrow, not next week.
如果在板子上没有电荷，这些液滴就只会由于重力掉下。
If there is no charge on the plate, these droplets will simply fall under gravity.
如果地板上没有血迹，那么这就不能算是一场悲剧。
If there was no blood on the floor, then it wasn't a tragedy.
如果系统上没有安装X，则必须在开始安装之前满足这一要求。
If X is not installed on the system, you must satisfy this requirement before beginning the installation.
如果命令行上没有给出文件名参数，我们就使用标准输入。
If a filename arg was not given on the command line, we use stdin.
如果还没有在所有节点上安装HACMP，现在就安装它。
Install HACMP if it is has not previously been installed on all the nodes.
如果 CDN上没有这个内容，那么它可以从原始 服务器获取内容，然后缓存并返回给用户。
If the CDN does not have the asset, it pulls the asset from the origin before caching and passing the asset along to the user.
在小型集群中，如果网络上没有太多设备，可以手工编写主机文件。
In a small cluster, you can write out the hosts file manually if there are not many devices on the network.
如果没有可以到google上查一下。
因此如果我们把它们都加起来，这个分子上应该没有净电荷，如果这个分子是中性的话。
So if we add them all up, there should be no net charge on the molecule, if the molecule is neutral.
如果您没有看见上一屏，则转至下面的故障排除一节。
If you do not see the screen above, then go to the Troubleshooting section below.
事实上，如果没有提供日期范围条目，或者没有匹配的日期范围，则会调用缺省目标。
If, in fact, no date range entry is supplied or if no date range matches, the default destination is invoked.
如果没有增强，土星环基本上是不能在组图上看到的。
With no enhancement, the rings would be essentially invisible in this Mosaic.
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