A：Crossed cousin marriage is not allowed in China.
表兄妹在中國(guó)是不允許結(jié)婚的。
B：It it true of many countries.
其他國(guó)家也是這樣。
A：You know why?
你知道為什么嗎?
B：Sure. If people are near in blood, they might pass on some genetic disease to the next generation.
當(dāng)然知道，近親結(jié)婚會(huì)給下一代帶來(lái)某些遺傳疾病。