The earth rotates on its axis once every 24 hours.地球每24小时依其轴心自转一次.The camshaft rotates in phase with the crankshaft, but at half its speed.凸轮轴和曲轴协调旋转, 但速度仅是曲轴的一半.The earth rotates once a day on its axis.地球绕它的自转轴一天旋转一周....
This became known as the streak method for isolating bacteria.这个方法以后就称为分离细菌的划线法.Air - conditioning ducts create a perfect Legionnaire's disease bacteria.空调系统 的输送管则是军团病细菌的绝佳温床.This method is effective to the facultat...