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Wikipedia definition
1. Compression ratioThe 'compression ratio' of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its largest capacity to its smallest capacity. It is a fundamental specification for many common combustion engines.
Read “Compression ratio” on English Wikipedia
Read “圧縮比” on Japanese Wikipedia
Read “Compression ratio” on DBpedia

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