这个国家虽然小，但植物种类丰富，从沙漠草原到热带丛林都有。

Though small, the country has abundant plants from desert grasses to tropical jungle.

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北面、西北面和西面的群山将城市和华北农业中心地带环绕，阻止了沙漠草原对这些地方的侵蚀。

Mountains to the north, northwest and west shield the city and northern China's agricultural heartland from the encroaching desert steppes.

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在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。

In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.

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