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4.分数的构成

分子用基数词，分母用序数词，分子大于1时，分母加s，如：

1/5：one fifth

2/3：two thirds

2-：two and three quarters

5.小数的表示法

0.09：point zero nine

2.7：two point seven

6.百分数的表达法

90%：ninety percent

0.5%：point five percent

7.倍数表达法

表示两倍时用twice，表示三倍以上的倍数时用times。如：

The earth is 49 times the size of the moon.

This desk is twice as large as that one.

8.算式表达法：

5+6：five plus six(or five and six)

7-6：seven minus six

2×3：two multiplied by three(or two times three)

8/4：eight divided by four

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