The mere existence of such a civilisation will tell us that long-term survival is possible, and gives us some cause for optimism.

这样一种文明的存在本身就会告诉我们，长期生存是可能的，并给我们一些乐观的理由。

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The ecological balance is the instinctive movement of the ecosystem by "self cause, self conduct, natural presence, and self existence".

生态平衡是生态系统“自因、自为、自然、自在”的本能运动。

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At first, they questioned their findings, but then Polacheck and Kamm realized that the cause of the discrepancy is the existence of two competing mechanisms.

首先，他们质疑了他们的发现，但是接着珀拉切克和卡姆意识到这种差异的原因是两种竞争机制的存在。

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That explains why the now-defunct site abruptly gave up the cause this morning after just 36 hours of existence, and it definitely explains why we never got any response to our emails trying to get further information.

ENGADGET: Nokia Plan B was just a hoax all along

And he could have used the massive research capacities of the Fed to document without question the existence of a bubble and the damage that its collapse would cause.

CNN: Why middle class has taken a big hit