But verifiers could not request proofs for more complicated conditions like the sum of certain attributes should be less/more than a certain value or an average of certain values is less/more than a certain value.
These simple arithmetic operations might not always be sufficient
但是验证者不能请求更复杂条件的证明，例如某些属性的总和应该小于/大于某个值，或者某些值的平均值小于/大于某个值。
这些简单的算术运算可能并不总是足够的