air-cooled single-cylinder four-stroke engine
气冷式单缸四冲程发动机 air-cooled single-cylinder four-stroke engine 气冷式四缸四冲程发动机 air-cooled four-cylinder four-stroke engine ..
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air-cooled single-cylinder four-stroke engine
气冷式单缸四冲程发动机
以上为机器翻译结果，长、整句建议使用 人工翻译 。