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.
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.
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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