人类语言中有几个独特的特征，且在很大程度上是其他物种的交流系统中从未发现的。

There're several features peculiar to human language that have, for the most part, never been found in the communication system of any other species.

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调查从未发现过任何证据。

Investigations have never turned up any evidence.

《柯林斯英汉双解大词典》

尽管这个很重要，研究人员却从未发现人类大脑编排日常事务的机理。

But important as it is, researchers have never understood the mechanism by which humans index the happenings of everyday life.

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