英语翻译
Earlymanufacturesofengines,becauseoflackofkoowledgeandequipmentincastingtechniques,wereonlyabletoproduceanengineassemblyhavingseparatecylindercastings,allmounteduponcrankcase.Whilethismethodisstillusedforsomeair-cooledengines,itisnotreallypracticalforaliquid-cooledengine.However,asmanufacturingtechniqueshaveimproved,thewhileconstruction[cylinderblockandcrankcase]isproducedinoneassembly.Cylinderblockformodernliquid-cooledenginesarecastassingleunits.求大神们准确的帮我翻译,要准确啊
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