in a way that produces no dirt, noxious gases, or other pollutants
干干净净地,清洁地,无有害气体地,无污染地
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the engine burns very cleanly .这台发动机消耗燃料时不排放任何有害气体。
without difficulty or impediment; smoothly and efficiently
顺利地;干净利落地
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he vaulted cleanly through the open window .他干净利落地跃出开着的窗户。[ORIGIN: Old English <Italic>clǣnlīce </Italic> (see <Bold>CLEAN</Bold>, <Bold>-LY<Superscript>2</Superscript></Bold>).]
(
〈古〉 (人,动物)爱清洁的。[ORIGIN: Old English <Italic>clǣnlīce</Italic> (see <Bold>CLEAN</Bold>, <Bold>-LY<Superscript>1</Superscript></Bold>).]