Do you know how it is when you see someone yawn and you start yawning too?
当你看到有人打哈欠时，你也会开始打哈欠，你知道这是怎么回事吗?
The brain is as active during REM (rapid eye movement) sleep when most vivid dreams occur as it is when fully awake, says Dr. Eric Nofzinger at the University of Pittsburgh.
匹兹堡大学的艾瑞克·诺夫辛格博士说，大脑在快速眼动睡眠期和完全清醒时一样活跃，大多数最生动的梦都发生在这个时候。
It is when the villagers choose a queen.
是时候让村民们选出女王了。
One of the most attractive aspects of corn ethanol is how environmentally friendly it is when compared to current automobile gasoline.
与目前的汽车汽油相比，玉米乙醇最具吸引力的一个方面是它很环保。
It is when you age much faster then normal.
就是比正常人更快地进入衰老状态。
Think how bright it is when it is switched on!
试想一下，当它打开的时候会发出多大的光亮。
It is when your spirit goes wandering upon the wind.
当你们的灵魂随风飘荡时。
The best time to do it is when the leaves are green.
最好趁着叶子还是绿色时就行动。
It is when production stagnates and begins its inexorable fall.
当产量停滞时它就还是不可避免的坠落。
It is when these genes mutate and go wrong that cancer develops.
因此，当这些基因突变或是出现问题时，随之而来的就是癌症。
Where you may miss it is when trying to quickly control playback.
而当你尝试快速控制播放时，你就会想念触控轮了。
Yes, in the same way that it is when people go buy a book at Costco.
是的，就像人们去好市多超市（Costco）买书一样。
Visually, it is when one cannot tell when one surface ends and another begins.
而在视觉上，就是你无法描述这两个曲面在何处头尾相接。
You realize how fast it is when you click on the chrome icon to open the browser.
当你点击chrome的图标打开浏览器的那一刻你将意识到它有多么的快。
It is when his novel turns to social commentary abroad that the trouble starts.
但他的小说一旦涉及国外社会评论，问题就来啦。
For example, for me it is when people say affirming words to me that I feel loved.
比如对我来说，当对方对我说出很坚定的话语的时候，我感到了爱。
We take our health for granted and only realise how important it is when we become ill.
我们觉得自己的健康是理所当然的，而且，只有在生病的时候我们才能意识它是多么的重要。
It is when we look at the changes between 2006 and 2009 that their scale becomes clear.
在我们观察2006年至2009年间的变化时，外部收支平衡状况的规模变得清晰起来。
It is when you suffer and you believe that your suffering has been caused by your beloved.
当你痛苦的时候，而且你相信你的痛苦是由你所爱的人造成的。
I believe it is when you are at your most vulnerable that people fall in love with you.
我相信当你在最脆弱的时候，人们会爱上你。
But it is when we cometo the realm of the spiritual that we find the greatest depth ofhuman need.
但是，只有我们进入到属灵范畴的时候，我们才发现人内心最深的需求。
It is when they have to distinguish between the two that these new brain cells really make a difference.
当老鼠不得不区别二者不同时新的脑细胞才真正显示作用。
It is when Heaven's heights are full in view that hell's gate is most persistent and full of deadly peril.
天堂高阁连云，历历在望，正当这个时候，地狱之门却大开，同时那地狱之门却最富有吸引力，成了旅客的最大危机。
What a wonderful sight it is when strings of their lights are reflected in the quivering water at nights!
夜间一行行一串串的灯火，倒影在颤摇的水光里，真是静美极了！
It is when we are angry that we most need to apply our proclaimed principles of humility and mutual respect.
只有当我们发怒的时候，才是最需要信守互谦互敬原则的时候。国际形势既不允许，我们也不应只满足于事物的表面状态。
It is when the load has been underestimated or when no testing has been performed at all that things can get ugly.
如果过低地估计了负载，或者根本没有执行任何测试，那么情况将会非常糟糕。
If the brain works just as hard sleeping as it is when we're awake, then maybe life is a waking dream [source: Eagleman].
如果我们清醒的时候大脑也像失眠那样在工作，那么人生只不过是做了一个清醒着的梦【来源：eagleman】。
That's all it is when my opponent keeps saying that my voting record always favors big business over the average citizen.
我的对立面说我在投票时老是从大企业的利益出发，而不考虑一般老百姓。
Fortunately, Internet Explorer helpfully tells the server who it is when it sends an HTTP request, as shown in Listing 3.
幸运的是，InternetExplorer在发送HTTP请求时可告知服务器浏览器的类型，如清单3所示。
Fortunately, Internet Explorer helpfully tells the server who it is when it sends an HTTP request, as shown in Listing 3.
幸运的是，InternetExplorer在发送HTTP请求时可告知服务器浏览器的类型，如清单3所示。
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