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The first known written mention of leprosy is dated 600 BC.

已知第一次提及麻风的文字记录年代为公元前600年。

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He became the first known American suicide bomber last October when he blew himself up in Somalia.

VOA: special.2009.10.17

People tend not to realize that the first question you should always ask yourself, is this really just something that's well-known in disguise?

已解决问题呢？,这是一个最短路径问题吗？,这是一个最近邻居问题吗？

麻省理工公开课 - 计算机科学及编程导论课程节选

A second finding building on the first is that we form impressions very fast, very quickly, and this is a literature known as "thin slices."

根据第一个发现，我们有了第二个发现,那就是第一印象形成得非常快，有一部文学作品叫《薄片》

耶鲁公开课 - 心理学导论课程节选

The first known American reference to what many recognize as our national pastime baseball happened in what year?

ENGADGET: blogger-avatar

Alpha-gal is unique in that it is the first known case of delayed anaphylaxis, she said.

CNN: Ticks causing mysterious meat allergy

Now, researchers speculate that it is the first known meteorite from our Solar System's innermost planet, Mercury.

BBC: Mercury meteorite puzzle