当两个等位基因不同时,称之为杂合性的.When the two alleles are not identical , they are said to be heterozygous.自交杂合子有一半杂合性, 因此远系繁殖可以产生适应能量更强的种群.Selfing heterozygotes halves the heterozygosity , and thus outbreeding maintains heterozygosit...
那些狗老是往墙上蹭，留下了斑斑污迹。The dogs are always rubbing against the wall and making dirty marks.用温和的漂白剂浸泡以去除污迹。Remove stains by soaking in a mild solution of bleach.他的白色外套污迹斑斑，简直脏透了。His white coat was grubby and stained....
The love of a mother for her children is dominant, leonine, selfish and unselfish.母亲对子女的爱是出众的, 强健的, 自私的,又是公正的.As a player he was unselfish, a true team man.作为一名选手，他毫无私念，真正把自己摆在团队中。It was unselfish of you to help us.你无私地帮...
Overcast skies portend a rough day for boats on Iceland's Lake Myvatn.阴云密布的天空为冰岛米湖上的船只预示了狂风暴雨的一天.What do these strange events portend?这些奇怪的事件预示着 什么 ?The change did not portend a basic improvement in social condition...