当你驱车到长城游览,风尘仆仆地在汽车上颠簸了好几个钟头的时候,不知你是否想到,汽车的心脏——发动机的工作比你要辛苦得多,活塞在汽缸里已经运动了几十万甚至上百万个来回。这样长年累月地几百万次、几亿次的推动汽车飞快奔驰,总有一天它也“年老力衰”没 When you drove to the Great Wall tour, busy in the car bumpy for several hours, I do not know if you think of the heart of the car - the engine work much harder than you, the piston in the cylinder has been a few dozen movements Million or even millions of back and forth. This years and months to millions of times, hundreds of millions of times to promote the car speeding Mercedes-Benz, one day it also “old age decline” did not