加工火花塞孔与反孔的复合角度。
Machining the spark plug hole and counter bore at a compound Angle.
从下至上的球队中，你可以看到拖车对黑洞的阀门和火花塞孔坐落关系。
From the bottom side you can see tow pairs of holes for the valves and the spark plug holes nestled between them.
当活塞上行压缩气缸中的混合气体，火花塞点燃气体燃烧，通过气缸上另一个孔排气。
As the piston moves up it is compressed, the spark plug ignites combustion, and exhaust exits through another hole in the cylinder.
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