We drove through red traffic lights, the horn blaring.我们鸣着喇叭，闯过红灯。The traffic lights were on amber.交通信号黄灯亮了。Traffic lights have been placed at all major intersections.所有重要的交叉路口都安装了交通信号灯。...
钻开牙齿, 去除腐坏的牙质.Give local anesthesia . Drill to open a tooth, clean dentine.结论: 空气喷砂机所制备洞形可保留更多正常牙质,有利于复合树脂材料的充填.COUCLUSION: The cavity which made with air - abrasion has more normal dentine and is suitable to resins....