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adj.& adv.三倍（的）；有三部分的，三重的； 英英释义： threefold[ 'θri:fəuld ]adj.three times as great or many"a threefold increase"同义词：treblethree-foldtriplehaving more than one decidedly dissimilar aspects or qualities同义词：doubledualtwofoldtwo-foldtreblethree-foldadv.by a fac
