In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit.
在任何情况下，没有发现预测到的化石并不表示它们不存在于未发现的矿床中。
That such deep events do occur has been accepted only since 1927 when the seismologist Kiyoo Wadati convincingly demonstrated their existence.
直到1927年地震学家KiyooWadati证明了这种深度地震的存在，人们才承认这种现象确实存在。
Aggression is a kind of innate survival mechanism, an instinct for self preservation, that allows animals to defend themselves from threats to their existence.
攻击性是一种天生的生存机制，一种自我保护的本能，使动物能够保护自己不受生存威胁。
They lack water-storing structures, and their existence on rock faces prevents them from tapping groundwater, so they have instead developed the ability to change their metabolism.
它们缺乏储水结构，而且它们长在岩石表面，这阻止了它们利用地下水，所以它们反而形成了改变新陈代谢的能力。
Leaders can't solve problems if they don't acknowledge their existence.
如果领导人不承认存在问题，就无法解决问题。
For most of their existence, humans lived in small, egalitarian hunter-gatherer bands.
远古人类大部分生存在小而平等的团队里依靠采集和狩猎为生。
Services must be traceable to one or more business goals to prove the reason for their existence.
服务必须能追溯到一个或多个业务目标，以证明其存在的必要性。
They are the wisdom of our society -- take advantage of their existence while they're still around.
他们是社会的智者——趁他们还在我们身边的时候，多去向他们学习吧。
Modern humans have lived as hunter-gatherers for more than 90 percent of their existence as a species.
作为一个物种，自从出现以来，现代人类90%的时间是以狩猎者-采集者的方式生存。
Not caring about someone is denying their existence: If people matter for you, you will matter for them.
不关心别人就是忽视他们的存在感，如果别人在意你，你也需要在意他们。
Not caring about someone is denying their existence: If people matter for you, you will matter for them.
如果不在乎别人就是在否定别人的存在：如果别人在乎你，那你也要在乎别人。
America's Labour market may be unique in the extent of its middle-class troubles, but not in their existence.
美国中产阶级就业问题的不断扩大可能独树一帜，但出现问题并不仅此一家。
But from a dialectical point of view, everything will be the opposite of their existence, scientific as well.
但从辩证的角度看，一切事物都会有他们的对立面存在，科学亦是如此。
After all, for Web 2.0 applications that are Web sites, the Web certainly is an integral part of their existence.
对于是Web站点的Web 2.0应用程序，Web肯定是它们的必备部分。
While you may never use atomic variables directly in your classes, there are good reasons to cheer for their existence.
虽然您可能永远不会直接使用原子变量，还是应该为它们的存在而欢呼。
I will admit that tachyons remain hypothetical, but then so do black holes, and who really doubts their existence anymore?
我承认，超光子一直停留于假定，但是黑洞从前也是假定的，但是现在谁还真的怀疑它的存在？
Zoos of various kinds are justifying their existence by providing a lifeline for the existence of critically endangered species.
各种动物园为极度濒危物种提供了生命保障，这证明了它们的存在是有道理的。
Corporations typically have perpetual duration and their existence is unaffected by the death or withdrawal of a shareholder.
公司通常会永久持续经营，并且其存在不受某股东的死亡或退股的影响。
It is not the consciousness of men that determines their existence, but their social existence that determines their consciousness.
并非是人类的意识决定了他们的存在，而是他们的社会存在决定了他们的意识。
Until texts predating their existence begin cropping up, these works of literature currently hold the title of the world's oldest.
除非有更古老的文本出现，这些文献作品目前仍是世界上最古老的。
Part of the difficulty is that we can only observe exoplanets indirectly, inferring their existence by the way they affect the stars they orbit.
困难之一是没法直接观测到系外行星，只能通过它们对其所环绕的恒星所施加的影响来推测其存在。
That probably understates the true effect, because even private firms understand that their existence depends on their relations with the state.
这一表述可能低估了真实的情形，因为，即使是私营公司，也清楚他们的生存取决于同国家的关系。
Direct evidence of gravitational waves has Einstein back in the news again now, since he originally proposed their existence a century ago.
引力波存在的直接证据如今让爱因斯坦再次回到了新闻里，因为正是他在一个世纪前最先提出了该理论。
To people of the modern world, professional choice is a solemn question which refers to their existence and whether their values can come true.
对于现代社会的人来说，职业选择是一个严肃的、涉及生存乃至价值实现的问题。
It is not the consciousness of men that determines their existence, but, on the contrary, it is their social existence that determines their consciousness.
不是人们的意识决定人们的存在，相反，是人们的社会存在决定人们的意识。
Modern humans have lived for most of their existence as hunter gatherers, so much of human nature has presumably been shaped for survival in such conditions.
现代人多数时候以狩猎采集为生，人性的很大一部分可能是在这种生存条件下形成的。
The following books are recommended as sources for substantive or theoretical enrichment; I do not ask you to buy them but you should know of their existence.
建议以下课本用来充实理论或实际的知识。我并不要求你们购买它们，但是你们至少应该知道它们的存在。
In the 1930s, Paul Dirac gave us an even better reason to believe in monopoles, when he showed that their existence would in turn explain the existence of electrons.
在20世纪的30年代，保罗·狄拉克甚至向我们提出了一个相信单磁极存在的比较充分的理由，他表示单极的存在可以反过来解释电子的存在。
In the 1930s, Paul Dirac gave us an even better reason to believe in monopoles, when he showed that their existence would in turn explain the existence of electrons.
在20世纪的30年代，保罗·狄拉克甚至向我们提出了一个相信单磁极存在的比较充分的理由，他表示单极的存在可以反过来解释电子的存在。
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