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释义：（在计算或目录的末尾额外）加上，附加； 英英释义： add on n.a component that is added to something to improve it同义词：additionadd-onimprovera supplementary component that improves capability同义词：accessoryappurtenancesupplementadd-onv.make an additionadd to the very end同义词：append
