另两个为胸腺嘧啶和胞嘧啶, 即称为嘧啶的单环结构.The other two, thymine and cytosine, are single ring structures called pyrimidines.直到不久以前,人们对胸腺的功能尚不明了.The function of the thymus was unknown until relatively recently.动物的免疫系统由两个主要部分组成,即胸腺和骨髓系统.I...
他急匆匆前往硬石小馆去吃午餐。He dashed off to lunch at the Hard Rock Cafe.小溪在硬石中侵蚀成一条水道.The stream eroded a channel in the solid rock.圆顶金光灿灿, 不再是由硬石构成, 而是火与光的结晶.The dome was radiant, formed no longer of solid stone, but of light and s...
Mediterranean oat held to be progenitor of modern cultivated oat.地中海地区燕麦,被认为是现代栽种燕麦的祖先.He was also a progenitor of seven presidents of Nicaragua.他也是尼加拉瓜7任总统的祖先。The newly - formed variety would probably inherit from its p...