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...
Deodorize the air inside refrigerator and freshen the foods stored.用于冰箱的除臭与食品保鲜.We watched the little boy toddle up purposefully to the refrigerator.我们看著那小男孩特意晃到冰箱前.A gas chromatographic method to quickly test the effici...