那时候，牙科学刚起步，拔牙都不打麻药。In those days, dentistry was basic. Extractions were carried out without anaesthetic.牙医拔牙时她痛得喊叫起来.She cried out with pain when the dentist pulled her tooth out.这时候,拔牙的准备已经做好了.By this time the dental in...
电阻器已经被涂上涂料啦.The resistors have been doped.将蜡件组浸入含有水玻璃等涂料的缸中, 涂上涂料.Dipping: The wax molds are dipped into solution , with surface coated by the solution....
In the western of China are intricate terrains and many hilly regions.我国西部地区地势复杂,多丘陵.Our area is a hilly area surrounded on three sides by mountains.我们这儿是一个山区,三面都是大山。The seasonal peak of Leptospirosis was not patency in ...