Unburnt vegetation rots quickly, but black carbon persists in the soil for many centuries.

未燃烧的植物腐烂得很快，但黑碳在土壤中存留了好几个世纪。

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"It's no disgrace to be colored," the black entertainer Bert Williams famously observed early in the century, "but it is awfully inconvenient."

黑人表演者伯特·威廉姆斯在本世纪初提出了一条著名的观点：“作为有色人种并不丢脸，但是极其不方便。”

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It's a complex issue, but he only sees it in black and white.

那是个复杂的问题，但他却只看到对与错的分别。

《牛津词典》

But that is just what scientists are planning to do deep below the Black Hills in South Dakota.

VOA: special.2009.07.21

She is a woman who looks very white but is categorized as black in that system of the South.

事实是，她虽比较白,但还是一个南方的黑人。

耶鲁公开课 - 1945年后的美国小说课程节选

The fact that white Americans favor white Americans over black Americans might be because of stereotypes but they also might be of in-group favoritism.

白人喜欢,白人，而不是黑人,可能是因为刻板印象,也可能是由于组内偏爱的心理。

耶鲁公开课 - 心理学导论课程节选

One black woman pointed this out by saying: "Some people say it's the colouring of the breast but in black women it's a bit hard to talk about colouring".

BBC: NEWS | Health | Women confused over breast advice

He can say listen, I went not only to the NAACP convention, but campaigned in black communities early on.

NPR: Analysis: Candidates' Minority Outreach

There are usually more African-Americans onstage than in the seats, but Springsteen is steeped in black music, and he was especially eager to play the date in Harlem.

NEWYORKER: We Are Alive