求翻译：　　3.足：即油足、水足、空气足。柴油、汽油和空气供应不及时或中断，就会出现起动困难，燃烧不良，功率下降，发动机不能正常运转等现象。若机油供应不足或中断，会使发动机润滑不良，机体磨损严重甚至出现烧瓦现象。若冷却水不足就会使机温过高，功率下降，磨损加剧，降低使用寿命。是什么意思？

　　3. foot: oil, water, air foot foot foot. Diesel, petrol and air supply less, or when interrupted, will appear starting difficulties, poor combustion, power is reduced, engine not running properly. If the oil shortage or disruption will give poor lubrication of the engine, there is even a Bush burning body wear serious phenomena. If insufficient cooling water machine temperature will be too high, power down, wear, lower service life.