倍 bèi
倍（bèi）means “-fold; times (multiples)”. 倍 expresses multiples and follows a number: 两倍 'twice', 三倍 'three times'. Formation: 数词 + 倍
-fold; times (multiples)
HSK4Formation
数词 + 倍
Explanation
倍 expresses multiples and follows a number: 两倍 'twice', 三倍 'three times'. The common pattern is 'A 是 B 的 N 倍' (A is N times B). With 增加了 N 倍, the amount grows by N times the original.
Examples
这本书的价格是那本的两倍。
zhè běn shū de jiàgé shì nà běn de liǎng bèi
This book's price is twice that of that one.
今年的产量增加了三倍。
jīnnián de chǎnliàng zēngjiā le sān bèi
This year's output has quadrupled (increased to four times the original).
Note
For 'twice' say 两倍, not 二倍. Note that 增加了三倍 means the increase equals three times the original.
FAQ
倍 — what does it mean and how is it used?
-fold; times (multiples). 倍 expresses multiples and follows a number: 两倍 'twice', 三倍 'three times'. The common pattern is 'A 是 B 的 N 倍' (A is N times B). With 增加了 N 倍, the amount grows by N times the original.
倍 — how do you form it?
数词 + 倍
倍 — any usage notes?
For 'twice' say 两倍, not 二倍. Note that 增加了三倍 means the increase equals three times the original.