Dark matter is especially tricky to find because of its dark nature.

由于与生俱来的“黑暗”特性，使得暗物质非常难以被发现。

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Dark energy's true nature remains a mystery. Theoretical attempts to account for its observed properties have foundered.

暗能量的真实本性仍然是个未解之谜，从理论上解释观测到的性状已经失败了。

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The precise nature of dark matter is unknown and over the years many contenders have been put forward to account for it.

暗物质的本质一直不为人知，许多年来也有很多粒子理论被提出，以视图对其进行解释。

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O'Neill was an Irish-American with a dark and violent view of human nature.

VOA: special.2011.01.06

Aristotle went on to say that the justice needed to control this dark side of human nature can be found only in a well ordered society of free people who govern themselves, and the only one that he knew was the Polis of the Greeks.

亚里士多德还说过,正义需要用来,控制人性的丑恶面,只有在公民自治的秩序井然的,社会里才能找得到正义,他所知道的这样的社会就是希腊城邦

耶鲁公开课 - 古希腊历史简介课程节选

And the myth has to do with these sort of pictures I was just describing where we don't actually live on the surface of the Earth of in the light, but rather live in certain hollows in the dark where we're mistaken about the nature of reality.

那个传说与我一直形容的,这个大局有关,我们并不真正生活在地表,生活在阳光里,而是生活在某种暗无天日的黑洞中,一个我们都误解了现实本质的地方

耶鲁公开课 - 死亡课程节选

Like the nature of dark energy, the nature of dark matter is unknown.

ECONOMIST: Research from the beginning of time

Though most people will insist they have seen this dazzling spectacle, dark skies as nature intended them are rare.

FORBES: Magazine Article

"It's the dark side of human nature, " says Mr. Overton, who has used a wheelchair for 58 years.

WSJ: Airports Battle Bogus Requests for Wheelchair Assistance