These facts, significant but unknown, were imperceptible on the surface.

这些意味深长但不让人知的小事，表面上是未被觉察的。

youdao

But unknown to Goebbels, a second master had been sent to neutral Switzerland.

但戈培尔不知道，还有一盒母带已经被送到了中立国瑞士。

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Before Columbus, the parasites that cause malaria were rampant in Eurasia and Africa but unknown in the Americas.

在哥伦布踏上北美大陆之前，导致疟疾在欧亚大陆和非洲大陆横行泛滥的寄生虫在美洲大陆并未现身。

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Not only did the always interesting Lady Gaga show up inside a large egg-like structure, but unknown artists also won top prizes.

VOA: special.2011.02.18

But now she is on her own, "with no direction home, like a complete unknown, like a rolling stone."

VOA: special.2009.06.21

The exact cause is unknown. But in a recent study, an experimental drug showed signs of halting the disorder in laboratory mice.

VOA: special.2010.05.19

He has no political record and was all but unknown until a year ago.

ECONOMIST: A billionaire has unexpectedly won Georgia��s elections

Five years ago, another likeable but unknown moderate Republican, George Pataki, dethroned New York's main political celebrity, Mario Cuomo.

ECONOMIST: Romancing the Apple

These kidneys have turned out to contain structures called nephrostomes tiny funnel-shaped ducts that are typical of aquatic vertebrates, but unknown in other mammalian embryos.

ECONOMIST: The elephant and the mermaid