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...
With the address printed out, the responding crews can attend to the reported address more expeditiously.奉召出动的队员接获印出的地址后,便能迅速地到达现场.Supermarkets often claim that they are responding to the wants of consumers by providing ...