每个大成年树木就如同一个巨大的水泵，通过其叶或针的蒸发，将成百万加仑的水回放到大气中去。

Each large mature tree ACTS as a giant water pump, recycling millions of gallons of water back into the atmosphere via evaporation from its leaves or needles.

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限制生奶销售这一法规在20世纪前半叶证明是全国公共卫生上的一大成功。

The regulation of raw milk sales in the first half of the 20th century proved to be a major public health success in this country.

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