但是，如果增强他们的狩猎运气是这些画的主要动机，那么就很难解释为什么只有少量画作有被长矛刺过的迹象。
But if improving their hunting luck was the chief motivation for the paintings, it is difficult to explain why only a few show signs of having been speared.
只有心理学家才会问这样的问题：为什么我们高兴时微笑，而不是怒容满面？
The psychologist alone can ask such questions: Why do we smile when pleased and not scowl?
这就是为什么即使现在熊也只有短短的尾巴，整个冬天都冬眠，而且一点也不喜欢狐狸。
It is that even to this day bears have short tails, hibernate all winter, and have no love at all for fox.
你失败了一次又一次，为什么你脸上没有痛苦，只有快乐？
You failed again and again, why don't you have pain but happiness on your face?
骑着只有一个轮子的自行车是一种平衡表演——这就是为什么独轮车被用于马戏团的原因。
Riding a bike with only one wheel is a balancing act—that's why unicycles are used in the circus.
为什么一个70岁的老人可以保持良好的状态来完成马拉松，而大多数年龄只有她一半的人却不能完成？
Why can a 70-year-old stay in good condition to complete a marathon, while most people half her age couldn't finish?
只有这样才能解释为什么需要在修正案中明确提到共同权力。
Only this would explain the need for an express reference to concurrent powers in the Amendment.
那么为什么从那时候其这些问题只有增加呢？
Why then have these problems only increased since that time?
这也能解释为什么这个过程如此低效：只有很小一部分细胞恰好获得合适的剂量。
That could explain why the process is so inefficient: Only a small fraction of cells happens to receive the correct dose.
这种假设或许可以解释为什么活跃星系中只有10%存在喷流，以及它们如何持续演变。
This scenario may explain why only 10% of active galaxies have radio jets, and how active galaxies evolve over time.
这可以解释为什么同一类型的肿瘤中只有部分病人能够受益于某种治疗。
This may explain why only a percentage of patients benefit from a treatment even though they all have the same cancer type.
你也许会质疑，为什么，美国整个的西部一半只有一个，或者说美国西部的三分之一。
You wonder why would it be that the whole western half of the U.S. gets only or the western third of the U.S..
只有当话筒放在前面中间的那个在笑的男人时，你才会明白为什么这个视频会搞笑。
It's only when the microphone is put in front of the laughing man in the middle that you understand why this video is so funny.
同理，如果在电脑上下国际象棋，为什么把骑士移动到主教3的位置或者其它位置，因为只有那样走才能保护将军。
Likewise, if you are playing a chess computer, the reason why it moves knight to bishop 3 or whatever might be because that's the only move to guard against checkmate.
随着时间的流逝，外遇就出现了，随后女人们就只有一个问题，已婚男人为什么要欺骗她们？
As time passes, extra marital affairs pop up and women have only one question then, why do married men cheat?
所有这些解释了为什么2007年兴建的40个晶圆厂有35个在亚洲，3个在美国，只有两个在欧洲。
All this explains why of the 40 fabs under construction in 2007, 35 were in Asia, three in America and only two in Europe.
人们在古罗马时期销售丧葬险,你可能会想,为什么只有丧葬险
They were selling that in ancient Rome, but you might think, but why just for burial?
毕竟，你的生日一年只有一次，为什么我要躲避呢？
After all, your birthday only comes around once a year, and why should I be hiding away?
教授：如果选民只有10个人，好，为什么那会帮助你们评价论点？
Prof: if the electorate was just 10 people, okay, why would that help you evaluate the argument?
这或许就是为什么该网站上在售的书只有大概300种吧。
Maybe that's why you will find there are only about 300 book titles on the website.
也只有这样才能解释，为什么两个不认识的人，通过几句话就有可能建立感情。
Only with this explaination can you understand why there are some people that can establish relationship within a conversation of several lines.
如果所有水果都是营养源，为什么在民间传说只有苹果？
If all fruits are nutritional powerhouses, why are apples the only one to be included in the folklore?
为什么在我所读的东西里，只有荷兰是列为，在这方面完全平等的。
Then why is it in all the things I read, it is only the Netherlands is sited as being completely egalitarian in this respect.
这是为什么去年菲律宾在教育上开支少于GDP的3%，而在医疗上的开支只有GDP的0.6%。
That is one reason why it could afford to spend less than 3% of GDP on education last year and only 0.6% on health.
这本书的读者那么多，为什么Amazon的评论只有11条呢？
Why are there only 11 Amazon reviews, while there are many more readers of the book?
这本书的读者那么多，为什么Amazon的评论只有11条呢？
Why are there only 11 Amazon reviews, while there are many more readers of the book?
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