冲程

冲程	chōng chéng	stroke (of a piston)
冲	chōng	(of water) to dash against / to mix with water / to infuse / to rinse / to flush / to develop (a film) / to rise in the air / to clash / to collide with
冲	chōng	thoroughfare / to go straight ahead / to rush / to clash
冲	chòng	powerful / vigorous / pungent / towards / in view of
程	Chéng	surname Cheng
程	chéng	rule / order / regulations / formula / journey / procedure / sequence