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.
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