The last phase in the FRL device is air lubrication. From the air, lubrication is completed by mixing a skinny mist of oil or other lubricants into compressed air.知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。The Fluid Chambers: dwelling the volumes inside which fluid is drawn in and pumped out