救援组织和西方国家官员估计﹐伊洛瓦底三角洲地区大约有200万人受到风暴袭击。
Aid groups and Western officials estimate as many as two million are vulnerable in the Irrawaddy River delta.
基于一般的流量三角形，我们在第二章中提出了乘法模型及边际和估计，并证明了在该模型下，参数的边际和估计就是链梯法估计。
Based on generalized run-off triangle, we introduce multiplicative model and its marginal-sum estimation in chapter 2. We get that the marginal-sum estimation is the chain ladder estimation.
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