Shortly after implantation the blastocyst wall, the trophoblast, consists of two layers of cells.植入之后不久,胚囊的壁, 即滋养细胞含有两层细胞.The blastocyst is then surgically introduced into the uterus of a foster mother.然后通过手术把胚囊引进寄养母体的子宫...
我想特莎应该选择长期默默爱慕她的马尔科姆。I think Tessa should plump for Malcolm, her long-suffering admirer.他对她的爱慕不只是肉体的吸引。His love for her was not just physical attraction.刚开始他的爱慕让她感到荣幸。At first she was flattered by his devotion....
这种气候上的变迁必然深深地反映在植物和冷血的爬行动物身上.The effect of these changes on plants and cold - blooded reptiles must have been profound.气候上,中国正陷入严重的干旱.CHINA is in the grip of a severe drought.气候上北部属热带, 部份属亚热带, 大部分属温带.The climate is tropi...