equivalency怎麽讀

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equivalency英語什麽意思：n.1.均等，相等，相當。2.【化學】等價，化合價相當；當量。3.等值；等量。4.(語詞的)同義；同類。5.【數學】等勢；等效。6.【地質學；地理學】等時代。