她把纸卷成球状.She rolled the paper into the shape of a ball.她审视着包在纸卷里面的戒指.She examined the rings that had been screwed up in the paper.用一支铅笔把纸卷起来. 它看起来像螺旋 吗 ?Wrap the paper a pencil. Does it look a screw?...
At last the designability of the protein strucure is analysed the compact model and incompact model.最后分析了在紧致和非紧致两种情况下蛋白质结构的可设计性.Land is silent, dormant, crop grows along with season, incompact not slow, go round and roun...
科学家根据那些化石的骨骼结构确定其年代.Scientists have dated the fossils by their bone structure.有两个因素对生物化石的保存是有利的.Tow factors are favorable for the preservation of organisms as fossils.它们是怎样变成化石的?How did they become fossils?...