我国干旱半干旱地区,天然降水量少且时程及地域相差大,并有很大的随机性。
The natural precipitation of arid and semi-arid region of China is very few and uneven distributed in time and space with stochastic property.
我国干旱半干旱地区,天然降水量少且时程及地域相差大,并有很大的随机性。
The natural precipitation of arid and semi-arid region of China is very few and uneven distributed in time and space with stochastic property.
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