A：Crossed cousin marriage is not allowed in China.
表兄妹在中國是不允許結婚的。
B：It it true of many countries.
其他國家也是這樣。
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.
當然知道，近親結婚會給下一代帶來某些遺傳疾病。