Black teenagers have an unemployment rate of 44 percent, twice the rate for white teens.

十几岁的黑人失业率达到44%，是同年龄段白人的2倍。

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But if spin can be proved a universal aspect of black holes, then the rate of spin can be used to infer something very important about a black hole's history.

但是如果旋转可以被证实是黑洞的一个通常的面目，那么，旋转速度就可以用来推断一个黑洞历史上一些重要的事。

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Scientists asked ten men and ten women to look at dozens of black and white cartoons and rate them on a 'funniness scale'.

研究人员让十名男性和十名女性看几十张黑白卡通画，并让他们对这些画进行“趣味评级”。

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This action targets those people that have been using credit cards as a way to purchase at the official rate rather than the black market rate, in effect creating a dual credit card exchange regime.

FORBES: Argentina Begins Tracking All Credit Cards

The black unemployment rate is 13.8%, and nearly 40% of black teenagers who are looking for jobs out of work.

FORBES: The Growth Recession On President Obama's Watch Continues

In November 1992 the Black unemployment rate was 13.7% but had declined to an even 10 percent in Nov. 1996.

FORBES: The Black Unemployment Litmus Test: Obama Needs a Growth Message...or Hillary Clinton