Now researchers estimate that nearly ten times as many such structures-of unknown purpose-may exist undetected under the Amazon's forest cover.

研究人员估计有近十倍于已发现的这种结构(不知处于何种目的建造)存在于未探测的亚马逊森林覆盖下。

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The researchers behind the January study, though, estimated that nearly ten times as many such structures—of unknown purpose—may exist undetected under the Amazon's forest cover.

研究人员通过1月份的调查认为，在亚马逊森林的覆盖下，估计还有比已发现的地面结构大十倍之多的地方还未被检测出来。

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Many of the matches are to genes of unknown purpose-for it is still the case, more than a decade after the end of the human genome project, that the jobs of many genes remain obscure.

很多匹配到的基因都是未知目的的基因，因为这依旧是个事实：人类基因工程结束后十年，很多基因的功能仍旧不清楚。

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It was once thought the hill was a burial mound, but no grave has been found and its purpose is unknown.

BBC: Prehistoric Silbury Hill 'was built in layers'

The purpose, as Newman points out is to discover the unknown: a Trojan, or bot that has evaded detection and is sitting on some infected host.

FORBES: Uncovering the unknown threat via beaconing detection

The purpose of the current Okeanos Explorer expedition is to help reduce that large unknown, by mapping and imaging features and creatures that may never have been seen before.

WHITEHOUSE: Watch Live: Be a Virtual Ocean Explorer