1.分数词的一般表示法：分子用基数词表示，分母用序数词表示，如果分子大于1，分母用序数词的复数形式。如：one-fourth，seven-ninths，two and three-fifths，thirty and seven-eighths。
You spend one-second of the monthly expense on body-building .
你将月开销的二分之一用于健身运动。
We covered one-half (of) the distance on foot.
我们步行了一半路程。
I think we＇ve covered three quarters of the distance now.
我想我们现在已经走了全程的四分之三。
Each piece is called one-fourth (or one-quarter).
每一块称为四分之一。
If I ate two pieces, I ate two-fourths, namely one-second.
如果我吃了两块，我就吃了四分之二，亦即二分之一。
2.分数词的特殊表示法。如：a(one) half，a quarter，three quarters，two and a quarter，one and a half，twenty-two over nine。
My bag is at least 21/2 times the weight of yours.
我的包至少是你们的两倍半重。
I give you one half, and keep the other half for myself.
我给你们一半，自己留了另一半。
A quarter of the students are girls.
学生中的四分之一是女生。
She used one-third of her income on clothing.
她把自己三分之一的收入用于服装。
Some $30 million, about one-sixth of the total budget, was spent on medical care last year.
去年约占总预算六分之一的三千万美元用于医疗保健。
This laptop computer is only one-tenth the weight of a normal desk-top computer.
这台膝上型电脑仅是一台普通桌上型电脑的十分之一重。