A: Crossed-cousin marriage is not allowed in China.

表兄妹在中国是不允许结婚的。

B: It it true of countries.

其他国家也是这样。

A: You know why?

你知道为什么吗?

B: Sure. If people are near in blood, they might pass on some genetic disease to the next generation.

当然知道，近亲结婚会给下一代带来某些遗传疾病。