1·The harder rocks push against each other, the hotter they become; in other words, pressure itself, not only the rocks' properties, affects frictional heating.
岩石相互推挤得越厉害，它们就会变得越热；换句话说，不仅是岩石的性质，压力本身也影响摩擦加热。
2·It has enough energy to overcome the frictional resistance in valves and registers.
它有足够的能量克服阀门和记录器的摩擦阻力。
3·Viscosity: viscosity is the crude oil in the flow caused by the internal frictional resistance, crude oil viscosity depends on temperature, pressure, dissolved gas and its chemical composition.
粘度：原油粘度是指原油在流动时所引起的内部摩擦阻力，原油粘度大小取决于温度、压力、溶解气量及其化学组成。
4·Rolling material support ball is set, to minimize fish tail with sheet bar and to reduce frictional resistance.
滚动托料球，减少板料划伤，并可减少摩擦阻力。
5·Drive tension is caused by resistance of driving force and cutting resistance and frictional resistance and it is not the same value at different places.
锯链的驱动张力是驱动力与切削阻力及摩擦阻力相对抗而产生的，在不同位置其大小不等。