全国翻译资格中译英常用英语句子结构使用备考：倍数表达

　　倍数表达

　　①用times表示倍数增加(一般限于包括基数在内三倍或三倍以上的数。表示两倍的数, 一般twice)。

　　第1种句型：.... times+形容词(副词)比较级+than...

　　This hall is five times bigger than our classroom. 这个大厅比我们的教室大4倍。(是我们教室的5倍大)

　　The car runs twice faster than that truck. 这辆轿车的速度比那辆卡车快1倍。(是那辆卡车的2倍快)

　　第2种句型：.... times+as+形容词原级(或much)或副词原级+as...

　　The big box is four times as heavy as the small one. 大箱子是小箱子的四倍重。

　　Asia is four times as large as Europe. 亚洲的面积是欧洲的四倍。

　　Ten is twice as much as five. 十是五的两倍。

　　The plane flew ten times as high as the kite. 那架飞机飞行高度是那个风筝的十倍。(高出九倍)

　　第3种句型：.... times+the+(size, height, weight, length, width等)+of

　　Your playground is 900 meters wide, three times the size of ours. 你们操场有900米宽, 是我们的三倍。

　　This street is four times the length of that one. 这条大街是那条街的四倍长。

　　This big tree is four times the height of that small one. 这棵大树的高度是那棵小树的四倍。(比那棵小树高三倍)

　　也可译成: The height of the big tree is four times that of the small one.

　　第4种句型：.... times+more+名词(可数, 不可数)+than...

　　There are four times more books in our library than in yours. 我们图书馆藏书(数量)是你们图书馆的四倍。(多三倍)

　　We have produced twice more grain this year than we did last year. 我们今年生产的粮食比去年增长一倍。(是去年的两倍)

　　第5种句型：.... times +as many(或much)+名词+其它……

　　There is three times as much water in this pot as in that one. 这个壶里的水(量)是那个壶里的三倍。

　　There are five times as many students as we expected. 到的人是我们预计的五倍。

　　第6种句型：.... times+that of+被比对象“是……倍”。如:

　　In this workshop, the output of July was 3. 5 times that of January. 这个车间七月份的产量是元月份的三点五倍。

　　②用double表示倍数增加了1倍，treble表示增加了2倍，quadruple表示增加了3倍。

　　The output has been doubled in the past five years. 过去五年中产量翻了一番(增加了1倍)。

　　China’s GDP was quadrupled in the two decades between 1980 and 2000.翻了两番(增加了3倍)。

　　③用by a factor of…表示增加至…倍

　　The drain voltage has been increased by a factor of 4.漏电压增加了3倍(增加到原来的4倍)。

　　④用fold表示倍数增加

　　Output of coal increased four-fold (four times). 煤产量增加了三倍。

　　注意：increase n times=increase n-fold=increase by n times=increase to n times=increase by a factor of n,都表示“增加至原来的n倍”或“增加了n-1倍”

　　⑤用again表示倍数增加

　　Line A is as long again as line B. A线比B线长1倍(A线的长度是B线的2倍)。

　　This machine turns half as fast again as that one. 这台机器转得比那台快半倍。

　　⑤如何表示倍数减少

　　The size of computers has been reduced (by)ten times in the past 30 years.在过去的30年中，计算机的尺寸减小了9/10(减少到原来的1/10)。

　　The principle advantage of the new machine over the old one is a four-fold reduction in weight. 与旧机器相比，新机器的主要优点是重量减少了四分之三(只有旧机器1/4重)。