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...
The city sprawls out to the west, north and south.该市向西 、 北、南方不规则地扩张[延伸].Explanation: Our magnificent Milky Way Galaxy sprawls across this ambitious all - sky panorama.说明: 我们宏伟的银河系蜿蜒穿过这幅高企图心之全天影像.The State Recreation Area...