美国短短几百年的传统文化在白人和黑人的血统鉴别上有个“一滴血原则”（one drop rule）： 无论肤色是深是浅，只要你身上有一点黑人血统，那法律上你就是黑人；只要有一点非白人血统就不是白人。
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one-drop rule 一滴法则
one drop rule
一滴规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And so it's creating this whole alternate way of having the one-drop rule because now people want to be classified as black.
NPR: Afro-Brazilian, African-American Ties
The rule gives three options for making a drop, one of which is to do so as "nearly as possible" to the site of the original shot.
CNN: Woods penalized two strokes for rules violation
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