众所周知，生育范围越狭小的种族就越易患遗传疾病。
That small, reproductively isolated groups of people are susceptible to genetic disease is well known.
如果他这样做一对夫妇生育一个跨种族的婚姻，他必须做的都是一样的，他说。
If he did an interracial marriage for one couple, he must do the same for all, he said.
新的数字显示，第二年的婴儿热潮，美国生育率高于一切种族集团，最高的是拉美裔妇女。
The new Numbers suggest the second year of a baby boomlet, with U. S. fertility rates higher in every racial group, the highest among Hispanic women.
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