这种恐惧机制对所有动物的生存都至关重要，但没有人能肯定人类以外的动物是否知道自己在恐惧。
This fear mechanism is critical to the survival of all animals, but no one can say for sure whether beasts other than humans know they're afraid.
这门课教的是理论，但没有任何东西能代替实践经验。
The course teaches you the theory but there's no substitute for practical experience.
没有什么简单或单一的因素能决定一个给定的地点是否会成为热带草原，但部分因素似乎在热带草原的形成中扮演着重要的角色。
There is no simple or single factor that determines if a given site will be a savanna, but some factors seem to play important roles in their formation.
尽管有很多黑客能创业，但没有人会投资他们。
While there are plenty of hackers who could start startups, there's no one to invest in them.
虽然有些人声称他们能预测未来，但这背后没有科学依据。
While some people claim they can predict the future, there is no scientific basis behind it.
他的笑容里没有一丝一毫的感情，但很少有眼睛能近距离或敏锐地察觉到这一点。
His smile had no heart in it, but few eyes were near enough or sharp enough to detect that.
这听起来很自大，但这是事实：我觉得我没有付出我能付出的，哪怕一部分。
It sounds arrogant, but it is the truth: I do not feel I have given out even part of what I can give out.
虽然很少有戏剧能像莎士比亚写的38部戏剧那样被人们广泛地演绎或分析，但关于他的生活几乎没有留存的细节。
Although few plays have been performed or analyzed as extensively as the 38 plays Shakespeare wrote, there are few surviving details about his life.
她去看了很多有名的医生，但没有人能治好她的眼睛。
She went to see lots of famous doctors, hut nobody was able to cure her eyes.
对于一只树蛙通常能活多久，我们确实知道得不多，可能只有几年，但没有证据表明它能长寿。
We really don't know a lot about how long a wood frog normally lives, probably just a few years but there is no evidence its longevity.
每个学生都收到了一份礼物，但没有什么礼物能比琳达从她爸爸那里得到的礼物更好了。
Every student got a gift, but few gifts can be nicer than that Linda got from her dad.
里德的研究表明，虽然没有什么能真正改变我们的 DNA，但孩子在出生前和出生后第一年所经历的环境差异有时能够影响 DNA 的表现方式，甚至使同卵双胞胎变成两个很不同的人。
Reed's research shows that though nothing can truly change our DNA, environmental differences that a child experiences before birth and in their first year can sometimes affect the way the DNA behaves, making even identical twins into very different people.
每个人喜欢的东西不一样，但没有谁的偏好能凌驾于他人之上。
Each person has things they like, but no one's preferences are any better than anyone else's.
然而，虽然水对生命无与伦比的重要，但至今都没有一个理论能圆满解释其神秘的特性。
Yetdespite water's overwhelming importance to life, no single theory hadbeen able to satisfactorily explain its mysterious properties - untilnow.
尽管20年代期间成立了许多受到爵士乐影响的规模较大的乐团，但没有一个能像爵士艾灵顿那样如此富有远见、野心和前途。
Though many larger jazz-influenced ensembles were forming by the end of the 20s, none showed greater promise, vision and ambition than Duke Ellington's.
我对“《最高天》是一个故事”的形容完全出自我的视点，但这误导了别人，因为没有任何标志能引导其他人从中获得一个故事。
My describing the Empyrean as a story is accurate from my viewpoint, but misleading, as there are no road signs to lead someone else to perceive a clear story out of it.
有一个说法是，它们还处于幼年，由于自己的重力所拉，在衰竭的同时发出热量，但没有人能肯定这种说法。
One theory is that they are youngsters, giving off heat as they collapse inward due to the pull of their own gravity, but nobody knows for sure.
大笔大笔的款项都经过他的手，但没有任何东西能稍稍改变他的生活方式，或使他在他所必需的用品以外增添一点多余的东西。
Considerable sums of money passed through his hands, but nothing could induce him to make any change whatever in his mode of life, or add anything superfluous to his bare necessities.
但没有数据能证实以上说法，实际上，研究显示，你需要被人爱，然后才会有爱的能力。
But there's no data to support that, and in fact, the research shows that you need to be loved before you can love.
但这些对艾拉来说基本没有吸引力，她希望能当一个企业家。
But, for Ella, this holds little appeal. She wants to be an entrepreneur.
但事实真相是并没有足够的确凿证据能证明这些东西真的有用。
But the truth is there's not enough hard evidence that any of these things really work.
另一方面，梅伦的亲密同事中，没有几个能像他保证的那样，“严格但公正”地执行联合。
For another, few of Mr Cameron's close colleagues can carry off the "tough but fair" combination with his assurance.
有些社交恐惧症是家族遗传，但没有人能真正说清楚为什么有些人有而有些人又没有。
Social phobia sometimes runs in families, but no one knows for sure why some people have it, while others don't.
一些重合的服务可能被取消，但没有哪家公司能占据足够大的市场份额从而来获得定价能力。
A few overlapping services might go, but neither airline would have too big a chunk of the market and thus undue pricing power.
我们最终得到的是我们根本不想要的东西，但似乎没有办法能走出这个怪圈。
We end up with exactly what we don't want, but there doesn't seem to be a way out of the rut.
有些药品声称能扩张血管，但并没有明确证据表明它真的能明显地做到这一点，并使病人的生活质量上升。
Claims are made for some tablets that dilate the blood vessels but there is little evidence that they make a significant difference, enough to improve the quality of life.
但波特先生没有哪本书能同他20年前的大热畅销书《国家竞争优势》相提并论。
Yet Mr Porter has not had the equivalent of a number-one hit since "the Competitive Advantage of Nations" 20 years ago.
我欣赏很多影片，但没有多少影片能像圣诞大餐那般滋养丰富，能让你心满意足之余还能有些许洋洋自得，而这正是我观看《公寓春光》所获得的感受。
I enjoy lots of films, but there aren't many that are like a very nourishing Christmas dinner, where you feel sated, full, satisfied, and a bit smug, but that's how I feel when I watch the Apartment.
她跟癌症抗争了整整八年的时间，但最终还是没有能战胜病魔。
For eight years she fought against cancer, but in the end her sickness had the last word.
她跟癌症抗争了整整八年的时间，但最终还是没有能战胜病魔。
For eight years she fought against cancer, but in the end her sickness had the last word.
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