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表
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达法倍数表达法倍数增加倍数增加A is N times as great（long，much，…）as B. （①）
A is N times greater （longer， more，…）than B. （②）
A is N times the size （length， amount，…）of B. （③）
以上三句都应译为：A的大小（长度，数量，……）是B的N倍[或A比B大（长，多，……）N-1倍]. nulle.g. This book is three times as long as (three times longer than/three times the length of) that one.
这本
书
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的篇幅是那本书的3倍（即长两倍）。
e.g. A is twice as tall as B.
A is twice taller than B.
A的身高是B的两倍或A比B高一倍。 nullincrease to n times（④）
increase n times／n-fold（⑤）
increase by n times（⑥）
increase by a factor of n（⑦）
以上四式均应译为：增加到n倍（或：增加n-1倍）。 nulle.g. The production of integrated circuits has been increased to three times as compared with last year.
集成电路的产量比去年增加了两倍。
e.g. The output of chemical fertilizer has been raised five times as against l986．
化肥产量比1986年增加了4倍。
e.g. That can increase metabolic rates by two or three times.
那可使代谢率提高到原来的2倍或3倍（即提高1倍或2倍）。
e.g. The drain voltage has been increased by a factor of four.
漏电压增加了3倍（即增加到原来的4倍）。
注：在这类句型中increase常被raise，grow，go/step up，multiply等词所替代。
nullThere is a n-fold increase/growth…（⑧）
应译为：增加n-1倍（或增至n倍）。这个句型还有其它一些形式：
e.g. A record high increase in value of four times was reported.
据报道，价值破记录地增长了3倍。 nulldouble (增加1倍)，triple/treble（增加2倍），quadruple（增加3倍），quintupling（增加4倍），sextuple（增加5倍），septuple（增加6倍）,octuple（增加7倍）,nonuple（增加8倍）,decuple（增加9倍）。（⑨）
e.g. The efficiency of the machines has been more than trebled or quadrupled．
这些机器的效率已提高了2倍或3倍多。 null此外，英语中还有一种用again而不用倍数词来比较倍数的方法，如：
A is as much （large，long，…）again as B.
=A is twice as much （large，long，…）as B.（⑩）
应译为：A比B多（大，长，……）1倍。
A is half as much （large， 1ong，…）again as B.
(= A is one and a half times as much （large， 1ong，…）as B.)（11）
应译为：A比B多（大，长……）一半（即A是B的一倍半）。 nullExercise:
他们今年的产量是去年的两倍。他们今年的产量比去年增加了一倍。
Their output this year is twice as much as what it was last year.
Their output this year is twice the amount of what it was last year.
Their output this year is as much again as what it was last year.
Their output this year is double what it was last year.
Their output this year has doubled, compared with what it was last year.
Their output this year has increased by 100% over last year.倍数减少
倍数减少
（1）A is n times as small (light, slow,…)as B.
A is n times smaller (lighter, slower,…) than B.
以上两句均应译为：A的大小（重量，速度。。。）是B的1/n 或A比B小（轻，慢。。。）（n-1）/n.
（2）decrease n times/ n-fold
decrease by n times
decrease by a factor of n
以上三句均译为：减少到1/ n 或减少（n-1）/ n.
（3）There is a n-fold decrease/ reduction…
应译为：减至1/ n 或减少（n-1）/ n.
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