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…