John used to divert himself with billiards.约翰过去总打台球自娱.a game of billiards一局台球赛Playing billiards is my chief recreation.打台球是我主要的娱乐活动。Jones simply walked over Brown at billiards.在弹子游戏中,琼斯不费吹灰之力赢了布朗....
The duplicates are attached to each other at a constricted region called the centromere.对偶体彼此相连于称为着丝粒的缩小的区域.Following the replication of chromosomes, resultant chromatids remain attached at the centromere.随着染色体的复制, 着丝粒始终...