It is not the primary tumour that kills, but secondary growths elsewhere in the body.
致命的并不是原发肿瘤，而是在身体其他部位的继发。
It is language intended not to reveal but to conceal, not to communicate but to obfuscate.
用这种语言的意图不是公开而是隐瞒，不是解释而是混淆。
Another temporary discount may not be what you want, but at least it is a bird in the hand.
再一次临时打折可能达不到你所希望的，但至少这是已经到手的东西。
They do not keep a tally of visitors to the palace, but it is very popular.
他们没有对来宫殿的游客作一个记录，不过这个地方非常受欢迎的。
This wire inside an electric lamp is not made of copper but it is made of tungsten.
电灯里面的电线不是铜丝而是钨丝。
This does not prove causality but is consistent with it.
这并不能证明因果关系，但与因果关系是一致的。
The appeal of mobile television is not so much that it is portable but that it is personal.
移动电视吸引人的地方并不在于它是便携式的，而是因为它的私人性。
It sounds amazing, and seeing it in action is wonderful, but Megahonyaku is not good enough.
它听起来很棒，亲眼目睹它的表演也很棒，但《超级本雅古》还不够好。
The ivory-billed woodpecker is not large, as birds go. It is about the size of a crow, but flashier.
象牙喙啄木鸟不像鸟那样大。它的大小和乌鸦差不多，但更华丽。
What is so impressive about it, however, is not its lengthiness but rather the reverse — the thrifty compactness of its construction.
然而，令人印象深刻的不是它的冗长，恰恰相反——是它简洁紧凑的结构。
This is an extreme example again, but it shows that the scheduling overhead of contention is not trivial.
这又是一个极端的示例，但它表明争论的调度开销并不是微不足道的。
It is doubtful whether an investor's sniping at management can ever be anything other than counterproductive, but in this case it is clearly not justified.
投资者对管理层的攻击是否只会适得其反是值得怀疑的，但在这种情况下，这显然是不合理的。
It looks like a bear but it is not a bear with a white and black coat.
它看着像只熊，但它不是皮毛黑白相间的熊。
The process seems so normal that we sometimes think of it as a natural part of growing up, but it is not.
这个过程看起来很正常，我们有时会认为这是自然成长过程中的一部分，但事实并非如此。
Working hard is not a guarantee of great success, but it is among the essential requirements.
虽然努力不能保证成功，但它是最基本的要求之一。
Epidemic meningitis is not the biggest killer in Africa, but it is one of the most greatly fearful of all diseases.
流行性脑膜炎并非是非洲最大的杀手，但是，它是所有疾病中最令人感到恐惧的一个。
"That is all very well," said he, "but still I do not know what it is to shudder!"
“这很好，”他说，“但我还是不知道害怕是怎么回事！”
Van Diemen's Land is not joined to Australia, but is divided from it by the wide strait to which Bass's name is now so justly given.
范迪门斯地并不与澳洲大陆接壤，而是通过一个一个宽阔的海峡与之隔海相望，这个海峡日后被恰当地命名为“巴斯海峡”。
It is so common that one might think it is a native plant, but it is not.
它是如此常见，人们可能会认为它是一种本土植物，但它不是。
There is something she wants to be to me, but she says it is not my mother.
她想成为我的某样东西，但她说不是我妈妈。
It sounds arrogant, but it is the truth: I do not feel I have given out even part of what I can give out.
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。
Now, if you look at the brain—if you took the brain out and held it up, it would look pretty symmetrical, but it actually is not.
现在，如果你看一下大脑——如果你把大脑拿出来、举起来，它看起来会是非常对称的，但事实并非如此。
Understanding this cycle is important, not only because it sustains life on Earth, but also because it is bound up with the rate of global warming.
理解这种循环很重要，不仅因为碳循环维持地球上的生命，而且因为它对于全球变暖的速度有密切关系。
Oh, there is another strange sea life, you know, the sea horse. It is a fish, but it does not look like a fish.
噢，还有一种怪异的海洋生物，那就是海马。海马是鱼，但是它长得又不像鱼。
It is not only tuna but sardine, mackerel and other fish that are in decline.
不仅仅是金枪鱼，沙丁鱼，鲭鱼和其他鱼类也在减少。
Generally speaking, the course on appreciating English films has impressed me most for it is not only instructive but also entertaining.
总的来说，“英语电影欣赏”这门课给我的印象最深，因为它不仅有教育意义，而且很有趣。
Believe it or not, 80% of netizens use it under the meaning of "It is not funny at all, but I have to smile."
信不信由你，80%的网友用这个词的意思是“一点都不好笑，但我不得不笑”。
Your teacher's grading system may be unwise, but it is not unethical.
你老师的评分系统或许是不明智的，但它不是不道德的。
Many people behave as if humans are the master of nature, but it is not the truth.
许多人表现得好像人类是大自然的主人，但事实并非如此。
Many people behave as if humans are the master of nature, but it is not the truth.
许多人表现得好像人类是大自然的主人，但事实并非如此。
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