肝细胞癌是最常见的人类致死性恶性肿瘤之一， 其死亡指数 ( mortality index )为0.94(RustgiV 1987报告)。Anonymous(1987)指出HCC常见于30岁到50岁。
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根据一个人的身高和体重可以算出其肥胖危险指数，指数越高死亡风险越大。
According to one's height and weight can calculate the obesity risk index the index is higher risk of death.
灾级大小是将一次灾害中死亡、伤害和直接经济损失数折算成规范化指数后计算出来的。其方法简单易行，且适用性强。
It is calculated through the translation of casualty and direct loss into a normal index, which is a method of simplicity and applicability.
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