(1)3倍に
(2)by a factor of three; "our rent increased threefold in the past five years"
さらに詳しく
(1)4倍で
(2)by a factor of four; "the price of gasoline has increased fourfold over the past two years"
(1)特別な程度に
(2)to an exceptional degree; "it worked exceptionally well"
(1)10回多く
(2)by ten times as much
(3)by ten times as much; "the population increased tenfold"
