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four stroke engine
met.	四冲程发动机
four-stroke engine
avia.	四冲程式发动机
racing	四冲程发动机
tech.	四行程发动机
four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke
environ.	四冲程发动机 (内燃机，其周期是由四个活塞冲程完成;包括吸气冲程、压缩冲程、膨胀冲程和排气冲程。)
four-strokes engine
tech.	四冲程引擎

four -stroke engine : 7 phrases in 4 subjects

Agriculture	1
Automobiles	1
Rail transport	2
Technology	3