大多数禾本科胚有一片瓣 状 结构通常称为外胚叶.Most grass embryos have a flap - like structure known as the epiblast.目的: 研究少汗性外胚叶发育不全引起先天缺牙的ED1基因突变.Objective : To detect ED 1 gene mutation in three hypohidrotic ectodermal dysplasia ( HED ) nuc...
Her long, fine hair was swept back in a ponytail.她纤细的长发在脑后梳成了马尾辫。Grabbing his ponytail, Shirley gave it a yank.雪莉抓住他的马尾辫，猛地一拽。She wears her hair in a ponytail.她梳着马尾发型....
你的英语学得怎样?How are you getting along with your English studies?我太笨,所以英语学得很慢.I have two left feet so I am slow in learning English.他的英语学得不错, 只是发音还不太好.His English is not bad, but his pronunciation isn't too good....
a leaflet on local places of interest有关当地名胜的小册子You've visited some places of interest in changchun , haven't you?你参观了长春的一些感兴趣的地方, 是 吗 ?The thing is, many places of interest have so many people.问题是, 许多名胜都人满为患....