杨说，冰川作用在地球的整个发展历史中都有发生，有证据表明它发生在二叠纪末期。

Glaciation, Young claims, has occurred throughout Earth's history, and there is evidence that it occurred toward the end off the Permian period.

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没有证据表明顶极植物形成过程中有这样一个相互作用的交流网络存在。

There is no evidence for such an interacting communicative network in a climax plant formation.

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杜克大学的研究人员详细核查了160多项已发表的研究，发现并没有强有力的证据表明这些方法中的任意之一能产生重大作用。

Researchers at Duke University scrutinized more than 160 published studies and found an absence of strong evidence that any of these approaches can make a big difference.

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