她带着他们走进一条空寂无人的小巷。She led them into a deserted sidestreet.夜间漂来一条无人的小船.A small boat drifted in during the night, with no one on board.我影只形单地站在无人的月台上.I found myself standing alone on the deserted platform....
胚胎的性别早在受精时就决定了。The sex of the embryo is predetermined at fertilization.收集母牛胚胎的方法有两种, 一种是直接通过产道, 另一种是施用外科手术.There are two methods of collecting cow embryos -- directly through the birth canal, or surgically.目的: 探索制作小鼠多倍体胚...