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。

youdao

When discussing evolution it is important to distinguish between the existence of evolution and various theories about the mechanism of evolution.

当我们讨论进化时，把进化的存在与多种关于进化的机制的理论区别开来是非常重要的。

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Wetlands are a special ecosystem with various ecological functions and one of the most important environments for the existence of mankind.

湿地是地球上具有多功能的、独特的生态系统，是人类最重要的生存环境之一。

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He notes that the makeup of the commission suggests it is more concerned with politics and using history and various historic facts to justify its own existence.

VOA: standard.2009.12.25

"I would love to go further than that (quarterfinals) and I know my fellow American players would love to as well, " Isner told Open Court at this month's San Jose Open, which is folding after 125 years of existence at various Californian venues.

CNN: March 4, 2013 -- Updated 1608 GMT (0008 HKT)

Since 1994, researchers have confirmed the existence of more than 700 planets circling various stars, with more than 2, 000 additional candidates under study by astronomers around the world.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate

Since 1994, researchers have confirmed the existence of more than 700 planets around various stars, with more than 2, 000 additional candidates currently under study by astronomers around the world.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate