除了流感病毒固有的突变能力，其它因素可通过完全不可了解的方式改变当前疾病模式的严重程度。
Apart from the intrinsic mutability of influenza viruses, other factors could alter the severity of current disease patterns, though in completely unknowable ways.
如果没有对地球科学的了解——关于风、风暴、气象学的知识，他们甚至不可能起步。
They wouldn't even have been able to get started without earth science understanding—knowledge about wind, storms, meteorology.
根据美国已经了解的情况，统计局的专家和其他人口统计学家在他们的视野中提供了一个不可抗拒的水晶球。
Working from what America already knows about itself, the bureau's experts and other demographers offer an irresistible, if clouded, crystal ball among their visions.
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