At least 3,000 kinds, of fish, live there, and one-fifth of all the bird species in the world.

至少有3000种鱼类生活在那里，世界上五分之一的鸟类也生活在那里。

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Do you know that one-fifth of the planet speaks Chinese?

你知道地球上有五分之一的人说中文吗？

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The board liked the idea but said it could offer just $ 25,000, one-fifth of the cost.

董事会喜欢这个主意，但表示只能出2.5万美元，而这是成本开销的五分之一。

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"At the rate we're going,we are expected to spend one-fifth of our economy on health care within a decade.

VOA: special.2009.05.15

In the United States, smoking rates are down from the past, but cigarettes still cause about one-fifth of all deaths.

VOA: special.2009.05.27

Gannett,the nation's largest newspaper publisher, has cut more than one-fifth of its jobs in the past two years.

VOA: special.2009.03.21

But more than one-fifth of the people surveyed, 21 percent, said there was too little suspicion.

CNN: Survey: Shock from terror attacks receding

More than one-fifth of children and 27% of blacks and Hispanics were poor, too.

ECONOMIST: Shocking numbers, just as sacrifices are being demanded

Indeed, the courtly South Carolinian's 42-year tenure represents one-fifth of the Senate's own 208-year history.

CNN: AllPolitics - Strom Thurmond Becomes Longest-Serving US Senator