A vacuum pump pulled the products of combustion through the pipe and exhausted them outside at the end of the run.
有一个真空泵把燃烧的产物推进管子，在管道行程的末端外面使这些产物彻底烧尽。
Valve Disadvantages: the valve is prone to leakage around the stem, especially in-board leakage when a vacuum is pulled on the valve outlet.
阀门的缺点：当阀门排气口处是真空时，阀门在阀杆附近容易泄漏，特别是内部泄漏。
A vacuum pump pulled the products of combustion through the pipe and exhausted them outside at the end of the run.
一真空泵把燃烧的产物推进管子，在管道行程的末端将其释放掉。
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.
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.
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。
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