1. When graveness disaster and risk happened, It resulted in the loss which can't estimate. 重大灾害与风险的发生，给社会造成了不可估量的损失。
2. With the increased graveness of the saltwater intrusion, more efforts have been put on the research activities on saltwater intrusion in estuary. 由于河口盐水入侵灾害的日益突出，该问题的研究受到了人们的关注。
3. Our country, which is one of the graveness earthquake taking place nations, locates in the joint of tow earthquake cinctures that are the Pacific Ocean and the South Mediterranean in the world. 我国处在世界环太平洋地震带和南亚地中海两大地震带的交汇地区，是世界上地震发生较为严重的国家之一。
