Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environment stress.

缓慢的、持续的变化可能是环境稳定时期的常态，而新物种的快速进化发生在环境压力时期。

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Most important, scientists are beginning to realize that the climatic changes have bad a major impact on the evolution of the human species.

最重要的是，科学家们开始意识到气候变化对人类物种的进化有重大的负面影响。

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Most important, scientists are beginning to realize that the climatic changes have had a major impact on the evolution of the human species.

最重要的是，科学家们开始意识到，气候变化对人类物种的进化产生了重大影响。

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These pictures show young readers what led Darwin to form his great discovery: the evolution of species through natural selection.

VOA: special.2009.02.27

"The human species is about evolution and is about moving forward, " said Eric Anderson, president of Space Adventures Ltd.

CNN: Opening the space frontier, one tourist at a time

That was because his hypothesis was that if linguistic evolution is jerky, the jerks will happen at the points where languages split the equivalent of species splits in biological evolution.

ECONOMIST: Linguistic evolution: Received pronunciation | The

Using informed but clear language, she guides the reader through Darwin's own encounters with giant tortoises, iguanas and finches on these islands in the 1830s that led him, years later, to formulate his theories about the origin and evolution of species.

ECONOMIST: Island life