几乎所有西方国家的森林都在扩大，过去树木相当少的地方增长最快。
Forests are spreading in almost all Western countries, with the fastest growth in places that historically had rather few trees.
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.
此外，他和他的同事利用其他种类树木的年轮记录重构了此地区过去的气候情况。
In addition, he and his colleagues used tree-ring records from other species of trees to reconstruct the region's past climate.
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