Scientists have long known about this variability.

科学家们早就知道这种个体差异了。

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Asian nations have long known about the greatness of ancient Chinese culture.

亚洲国家很早以前就知道古代中国文化的博大。

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Biologists have long known about the switches, which are clusters of atoms called methyl groups.

生物学家早已知道这个开关，它是由原子组成的，叫做甲基。

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He seems to have known something about the modern economic theory of society long before modern economics was even developed.

而且是公开的驳斥,他似乎已知现代社会的经济原理,且是在现代经济学开始发展之前。

耶鲁公开课 - 政治哲学导论课程节选

Advertisers have long known about a problem with mobile ads: fat fingers.

FORBES: Google Cuts 'Fat Finger' Accidental Clicks On Mobile Ads

Those of us who actually understand monetary operations have long known about the coin and have been pushing it for close to 2 years now.

FORBES: Platinum Coin? Grow Up.

What should the players have known about long-term health risks before entering the NFL, and were they made aware of information as it became available?

FORBES: CTE Research, NFL's Financial Headache, and Tobacco Industry