Blacks who tried to change the system risked being beaten or killed.

试图改变这一制度的黑人面临着被殴打或被杀害的危险。

If you're very high on the traits in the dopamine system, risk taking, novelty seeking, curious, creative, you tend to be drawn to people like yourself.

如果你的多巴胺系统中这些特征很高，冒险 、寻求新奇、 好奇、有创意，那么你会被跟你相似的人吸引。

But because the " base rate" is lower still-there are, mercifully, very few terrorists-even a well-designed system risks sending large numbers of spies off on wild-goose chases.

但是由于“基本比率”仍然较低——幸运的是，恐怖分子很少——即使是一个设计良好的系统也有可能使大量间谍在徒劳的追捕中丧命。