Wow! So many beautiful roses. Which sister was hit by the arrow of Cupid in our dormitory?
哇!这么漂亮的玫瑰,丘比特之箭射中咱们宿舍哪位姐妹了?
Whether they are a peculiar sister group, or the ur-snake from which all others descend?
它们究竟是一种特殊的分支种群,还是其他各种蛇类的鼻祖?
Centromere is the primary constriction on the chromosome, a region at which the sister chromatids are held together.
着丝点是染色体的主缢痕,在这个地方姐妹染色单体连在一起。
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