The author is virtually unknown outside Poland.

在波兰以外，这位作者实际上鲜为人知。

《牛津词典》

A hundred years ago coronary heart disease was virtually unknown in America.

100年前，冠心病在美国几乎从未有过。

《柯林斯英汉双解大词典》

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。

youdao

Hawk, a 31-year-old wholesome-looking father of two, was virtually unknown outside the skateboarding world three years ago.

FORBES: Later, Skater

Huawei, the telecoms infrastructure giant - virtually unknown as a phone brand in many parts of the world.

BBC: Huawei, Blackberry - and the battle for third place

Until its public offering in 2005 Suzlon was virtually unknown and had to hard-sell its credentials.

FORBES: Magazine Article