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Wikipedia definition
1. Stroke ratioIn a reciprocating piston engine, the stroke ratio, defined by either bore/stroke ratio or stroke/bore ratio, is a term which is used to describe the ratio between the diameter of the cylinder bore and the length of the piston stroke within its cylinders.
Read “Stroke ratio” on English Wikipedia
Read “ボアストローク比” on Japanese Wikipedia
Read “Stroke ratio” on DBpedia

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