Fresno, in the central valley, comes top of the list in America for year-round pollution.

位于中央山谷的弗雷斯诺在美国全年污染排行榜上居于首位。

That requires lengthy and expensive mountain tunnels and the estimated 22 billion leg connecting the central valley to San Francisco.

这需要修建极长且昂贵的山地隧道，以及连接中央山谷和旧金山的路段，造价约 220 亿美元。

This continuous process, known as seafloor spreading, results in a ridge with a central rift valley.

这种连续的过程被称为海底扩张，形成了带有中央裂谷的海脊。

This temporary wetland in California's central valley created at just the right time and place, to serve migrating birds on a very long journey.

这片位于加利福尼亚州中央山谷的临时湿地在正确的时间和地点为迁徙的鸟类提供了长途旅行的服务。

Parts of the " High Desert" of Washington, Oregon, Idaho and Nevada have grassland, as does the low-lying central valley of California.

华盛顿州、俄勒冈州、爱达荷州和内华达州的“高沙漠”部分地区有草原，加利福尼亚州低洼的中央山谷也是如此。

In another half-century, the people of the central valleys should have hundreds of millions to throw away more easily than in 1900 they could throw away tens; and by that time they might know what they wanted.

再过半个世纪， 与 1900 年相比， 中部山谷的人们应该更容易扔掉数亿； 到那时他们可能知道自己想要什么。