排气行程 meaning in English

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discharge stroke
exhaust stroke
instroke
out stroke
scavenging stroke

This action could open an inlet valve for an intake stroke , or open an exhaust valve for an exhaust stroke
这过程能使进气门在进气行程打开，或者排气门在排气行程打开。
If the exhaust valve opened at bdc at the beginning of the exhaust stroke and closed at tdc at the end of the exhaust stroke , it would have a duration of 180
如果排气门在排气行程的下止点打开并且在这次行程的上止点关闭，它将有180的持续。