プログレッシブ和英中辞典(第4版)の解説
にばい【二倍】
twice; double
ひと月に彼の２倍本を読む
I read twice as many books as he does in a month.
３の２倍は６
「Two times [Twice] three is six.
私はその２倍欲しい
I want twice as much.
彼の年齢は私の２倍だ
He is twice my age.／His age is double mine.
この３年の間に鉄道運賃が２倍になった
Railroad fares have doubled in the last three years.