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.嘌呤为嘧啶取代或嘧啶为嘌呤所取代,叫做颠换.The substitution of a purine for a pyrimidine, or vice versa is a transversion.本文研究氟脲嘧啶(5—...
大量芽状突出物形成,并被脱出以获得微细胞.A larger number of budlike protuberances form and are pinched off to give microcells.从这一观点来看,城市是个象山岳一样的自地面升起的突出物.From this standpoint the city is an elevation, rising from the ground like a mountain....
他获得了“原子可以再分”这一概念的专利权。He patented the idea that the atom could be split.天气预报概念的发展速度快得令人难以置信。The idea of weather forecasting developed incredibly quickly.哲学家停留在概念的王国里.A philosopher dwells in the realm of ideas....