valve port
下开式气门口 Downward valve opening
气门侧口损坏 valve side port damage
气门排出口 valve drain
气密入口门 airtight access door
进气门出口流场 Flow field around inlet valve exit
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当这发生时，气门弹簧紧紧地封闭气门口，叫做气门座。
As this occurs, valve springs pull the valve tightly closed against its opening, called the valve seat.
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当这发生时，气门弹簧紧紧地关闭气门口，叫做气门座。
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