在比较运算中用不带正负号的变数与零比较。
An unsigned variable was used in a comparison operation with zero.
如果它们的值不是零，该变数便会落在目前范围的位移内。
If their value is zero, they are ignored and the variable is defined throughout the entire scope.
除此之外，也有必要从动物的癌变数据外推至人类癌变水平，并解决人类接触水平上的不确定性。海底交混响就是按时间外推到一种时间零值的。
Beyond that problem, it is necessary to extrapolate cancer data from animals to humans, and to deal with uncertainty about the levels of human exposure.
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