在各种自然灾害的发生机率、对社会经济造成的损失中，又以水灾及旱灾最为频繁和严重。
Among the different probablities of occurances and the social and economic losses of all kinds of natural disasters, flood and drought are the most frequent and serious.
在各种自然灾害的发生机率、对社会经济造成的损失中，又以水灾及旱灾最为频繁和严重。
Among the different probablities of occurances and the social and economic losses of all kinds of natural disasters, flood and drought are the most frequent and serious.
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