在过去的四十年里，中国取得了巨大的进步。

China has made great progress during the past forty years.

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在过去的四十年，中国种植了数十亿的树木来作为主要遏制北方沙漠延伸的举措之一。

Over the past forty years, China planted billions of trees as part of its fight against expanding deserts, mostly in its north.

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在过去的四十年里。

During the past four decades.

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For at least four decades, people have been building tools called debuggers.

在过去的至少四十年里,人们一直在做一种叫做调试器的工具。

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