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| English | Chinese |
| 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 | 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。) |
| two-stroke engine An internal combustion engine whose cycle is completed in two strokes of the piston | 二冲程发动机 (一种内燃发动机，其循环是通过两个活塞冲程完成。) |