USFWS also set an interim goal of restoring prairie chicken populations to an annual average of 67,000 birds over the next 10 years.

美国鱼类及野生动物管理局还设定了一个临时目标，即在未来10年内将草原榛鸡的数量恢复到年均6.7万只的水平。

youdao

The annual average temperature is 0.8-4.3c.

年平均气温是0.8到4.3摄氏度。

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The annual average precipitation was 659 millimeters, up by 8.0 percent.

全年平均降水量659毫米，增加8.0%。

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That is one-quarter of the country's average annual rainfall.

VOA: standard.2009.09.08

More than 150,000 people have left their homes in Burkina Faso, many in the capital Ouagadougou, where the United Nations says the amount of rain that fell in one day last week equals one-quarter of the nation's average annual rainfall.

VOA: standard.2009.09.06

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