Pellagra was virtually unknown at that time in the Americas, however, even among people who subsisted primarily on maize.
然而，糙皮病在当时的美洲几乎还不为人所知，甚至在主要以玉米为生的人之间也是如此。
Blogs were virtually unknown five years ago; now they are unavoidable.
五年前很少为人所知的博客，如今已妇孺皆知。
West Africans, and people of West African descent, are susceptible to a disease called sickle-cell anaemia that is virtually unknown elsewhere.
如西非人以及他们的后代易患一种叫做镰状细胞性贫血的疾病，这种病在西非之外几乎都没人听说过。
This famous concert was one of the most important and memorable points in the pianist's career. He was virtually unknown until that evening; he woke up the next morning as a legend.
这是他最重要的音乐会之一，那天之前他是无名人，那天之后他成了传奇。
Her field of choice—Noetic Science—had been virtually unknown when she first heard of it, but in recent years it had started opening new doors of understanding into the power of the human mind.
她的研究方向是神经科学，几年前没有几个人知道这是什么。但在近几年，神经科学已经开始被越来越多的人了解了，因为它为理解人类思维的力量开启了崭新的大门。
Her field of choice—Noetic Science—had been virtually unknown when she first heard of it, but in recent years it had started opening new doors of understanding into the power of the human mind.
她的研究方向是神经科学，几年前没有几个人知道这是什么。但在近几年，神经科学已经开始被越来越多的人了解了，因为它为理解人类思维的力量开启了崭新的大门。
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