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四冲程发动机 sìchōngchéng fādòngjī
agric.	four-stroke cycle engine
auto.	four-stroker
dril.	four-cycle engine; Otto cycle engine
environ.	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 (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。)
met.	four cycle engine; four stroke engine
racing	four-stroke engine; 4 stroke engine

四冲程发动机: 6 phrases in 3 subjects

Automobiles	4
Aviation	1
Technology	1