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Wikipedia definition
1. Cylinder blockA cylinder block is an integrated structure comprising the cylinder(s) of a reciprocating engine and often some or all of their associated surrounding structures (coolant passages, intake and exhaust passages and ports, and crankcase). The term engine block is often used synonymously with "cylinder block" (although technically distinctions can be made between en bloc cylinders as a discrete unit versus engine block designs with yet more integration that comprise the crankcase as well).
Read “Cylinder block” on English Wikipedia
Read “シリンダーブロック” on Japanese Wikipedia
Read “Cylinder block” on DBpedia

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