我国幅员辽阔、地形复杂、气候多变,人口众多,每年都有许多重大的自然和人为灾害发生,给国家和人民带来巨大的经济和生命损失。全世界每年都有10～20%的人遭受不同的灾害,这个不愉快的数字还在迅速上升。最大限度的防减灾害带来的损失已是人类面临的艰巨任务。 With its vast territory, complex terrain, changing climate and a large population, many major natural and man-made disasters have taken place each year, causing huge economic and loss of life to our country and our people. Every year, 10 to 20% of people in the world suffer different disasters, and this unpleasant figure is still rising rapidly. The maximum loss reduction brought about by disaster prevention is a daunting task facing mankind.