- overthepastyears,floods,droughts,landslides,anddust-stormshavefrequentedourplanet,theonlyhabitatofhumanbeings。severaldaysago,tsunami(海啸)hassweptthesoutheastasia,whichhascausedenormousdamage。allthesehavesoundedanalarmtohumanbeings。thedestructionwhichisc...
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