你和你的兄弟姐妹有相同的父母，相同的祖先，但是怎么可能会有不同的祖先基因？本文讨论同家族成员为什么有不同的 DNA 和造成基因测试不准确的因素。 词汇：ancestry 祖先 Have you ever wondered why your brother or sister doesn’t look exactly like you despite having the same family ...

Britain's most famous landmark is in need of repairs.