我们已知道燃烧产生高压，并推动活塞下行，带动曲轴转动。
We have noted that this combustion produces a high pressure that pushes the piston down so that the crankshaft is rotated.
当活塞下行时，棘轮连接活塞杆和发动机轴，因此将功率输送出去。
As the piston descended, a ratchet engaged the piston rod and engine shaft and thus power was transmitted.
在进气行程，活塞下行，进气门开启，产生真空使空气被吸进发动机。
On the intake stoke, the piston moves down and the intake valve is opened, a vacuum is produced and causes air to be drawn or pulled into the engine.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
结果表明，随着活塞的不断下行，燃烧空腔各阶模式的特征频率向低频方向移动。
The results show that the characteristic frequencies of different modes will move to the low frequency domain as the piston moves downward.
压力的大幅度升高使得作用在活塞顶部的力足够大，从而迫使活塞一直延气缸下行。
This pressure rise is so great that a force is exerted upon the top of the piston that is sufficient to force the piston all the way down the cylinder.
压力的大幅度升高使得作用在活塞顶部的力足够大，从而迫使活塞一直延气缸下行。
This pressure rise is so great that a force is exerted upon the top of the piston that is sufficient to force the piston all the way down the cylinder.
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