Each of these life - sustainng agents begins as a stem cell , a sort of hematological embryo.这三种维持生命的要素都起源于干细胞.干细胞是血液的胚胎.Dolly's legacy includes the possibility of making patient - specific embryonic stem cell lines...
In those days, dentistry was basic. Extractions were carried out without anaesthetic.那时候，牙科学刚起步，拔牙都不打麻药。His work was important in helping establish dentistry as a separate profession.他在推动牙医学发展成一门独立学科的过程中发挥了重要作用.Health Sc...
The girls watched, little teasing smiles animating their faces.女孩们注视着，脸上挂着调皮的微笑，显得愈加活泼。Nature has her animating spirit as well as man who is nature's child.大自然就象它的孩子――人类一样,有活生生的灵魂.They were doubtlessly the animating...
The map shows the position of the new landfills.这张地图上标有新的废物填埋场的位置。It was estimated that these landfills could be used up to 2020.据估计,这三个堆填区只可应付目前的需要至2020年.The anti - seepage system is one of the important components of s...