活塞是一个中空的圆柱体形状部件，其在发动机气缸里做上下往复运动。
The piston is a cylindrical shaped hollow part that moves up and down inside the engine cylinder.
曲轴，也叫做发动机的“脊柱”，其作用是将活塞的上下往复运动转换成为旋转运动，并且控制着整个的功率输出。
The crankshaft, regarded as the "backbone" of the engine, serves to change the reciprocating motion of the piston into rotary motion and handles the entire power output.
这并不意味着活塞将以两倍于正常速度上下运动，因为浪费的火花出现在排气行程中，和没有任何压缩。
This does not mean that the plugs will wear at twice the normal rate, as the wasted spark is on the exhaust stroke, and is therefore under no compression.
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