Nevertheless, in those societies in which matrilineal descent occurs, access to socially powerful positions is mediated through the maternal line of kin. 無(wú)論如何，在那些母權宗系遺傳的社會(huì )，是由母系親屬來(lái)掌握社會(huì )上最有權力的地位。
Each haplogroup is defined by set of characteristic mutations on the mitochondrial genome, and can be traced along a person's maternal line to a specific prehistoric woman. 每一個(gè)單倍組都是根據線(xiàn)粒體基因組的變化特征來(lái)定義，可以追溯一個(gè)人的母系遺傳線(xiàn)索，直到一位特別的史前女性。
The surface generated by a straight line,the generator,passing through a fixed point,the vertex,and moving along a fixed curve,the directrix. 錐面由一條直線(xiàn)，即母線(xiàn)，通過(guò)一固定點(diǎn)，即頂點(diǎn)，沿一給定曲線(xiàn)，即準線(xiàn)，連續移動(dòng)而產(chǎn)生的平面。
