占百分之几，几分之几
1….to form/comprise/make up/constitute ….percent …占百分之…
eg. Women comprise more than 50% of the US.population.
eg. Females make up only 24% of the illustrations whereas males constitute 76%.
2.…to form/comprise/constitute a half/third/fourth of……占…的1/2,1/3,1/4
eg. Female illustrions form less than a fourth of the total.
3.…account for…percent 占百分之几
eg. ……, accounting for approximately 20 percent of…
倍数
1.A be …times as much/many as B
eg. The annual rainfall of Hunan is 5 times as much as that of Sichuan.
2.A doubles/is half/triples B A是B的两倍，一半，三倍
eg. The annual rainfall of Jidda doubles that of Janta, but is only half the amount of rain Kuwait receives each year.
It would be expected to increase 5 times.
the table shows a three times increase over that of last year.
the number is 5 times as much as that of 1995.
It has decreased almost two and half times, compared with…
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