有人说,一部人类史,就是一部与灾难抗争的历史。我国是世界上遭受自然灾害影响最为严重的少数国家之一。灾害种类多,发生频率高,分布地域广,造成的损失大,是构成我国基本国情的重要内容。为防御自然灾害而产生的社会需求,则是我国 Some people say that a history of human beings is a history of fighting disasters. Our country is one of the few countries in the world that have suffered the most from natural disasters. There are many kinds of disasters, their occurrence frequency is high, their geographical distribution is wide, and the losses caused by them are large. They constitute an important part of China’s basic national conditions. The social needs arising from the defense of natural disasters are ours