用矢量基础图件叠加来获取单元图斑的方法是GIS的基本功能，但叠加多边形的不确定性成为影响GIS数据质量的灾难性因素。
It is the basic function for GIS to get unit polygon by overlaying the vector map, but the uncertainty of polygon is the disastrous factor affecting GIS's data quality.
灾难性的降雨在巴西(与其他国家)变得更频繁出现，但造成高伤亡数字的大部分因素与大地更密切相关。
Catastrophic rains have become more frequent in Brazil (and elsewhere). But much of the blame for the high death toll lies closer to earth.
另一个非常重要的令人担忧的因素是由于现在的全球金融网络的复杂性使得偶然性的灾难性失败变得难以避免。
An overarching worry is that the complexity of today’s global financial network makes occasional catastrophic failure inevitable.
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