"a threefold increase"
同义词： treble three-fold triple
"our rent increased threefold in the past five years"
同义词： three times
以上来源于: WordNet
ADJ equal to or having three times as many or as much; triple 三倍的; 三重的
a threefold decrease
ADV by or up to three times as many or as much 三倍地
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