プログレッシブ和英中辞典(第4版)の解説
ばい【倍】
❶〔２倍〕
５の倍は10だ
Twice [Two times] five is ten.
彼の部屋は私の部屋の倍の広さだ
His room is 「twice as large as [twice the size of] mine.
その機械を使えば倍の仕事ができる
We can do double the work by using that machine.
❷〔…倍〕times
５を何倍すると100になるか
What times 5 is 100?
この木はあの木の2.5倍の高さだ
This tree is two and a half times 「as tall as that one [the height of that one].
物価が２倍,3倍と上がったので支払いに困った家族が多い
Prices doubled and then tripled, and many families couldn't pay their bills.