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1·That is almost one fifth of the world's population.

这几乎是世界人口的五分之一。

2·One fifth of the world's fresh water is also found in the Amazon Rainforest.

世界上五分之一的淡水也存在于亚马逊雨林中。

3·It covers an area of about 1.8 million square kilometers, about one fifth of the national total.

它的面积约180万平方公里，约占全国总面积的五分之一。

4·They save one fifth of their net monthly income.

他们把每月净收入的五分之一存起来。

5·By 2020, one fifth of the country's 150, 000 km railway network will be used by high-speed trains.

到2020年，中国15万公里铁路网的五分之一将供高速列车使用。

6·In 1998 the typical black family's net wealth was $16,400, less than one fifth that of white families.

1998年，标准的黑人家庭的净资产为16400美元，不到白人家庭的五分之一。

7·Studies show that people use approximately one fifth less energy when they are billed for exactly what they use.

研究表明，当人们按实际使用量付款时，他们使用的能源大约减少了五分之一。

8·Nearly one fifth of all the electricity generated worldwide is produced by turbines spun by the power of falling water.

世界上近五分之一的电力是由利用落水动力旋转的水轮机产生的。

9·One fifth of the country was under water.

全国五分之一地区被水淹没。

10·Almost one fifth of men say they do not cook at all.

近五分之一的男性说他们根本不做饭。