但是由于孕产妇死亡率也存在很高的不确定性，所以很难阐明是否真正有所降低[2]。

However, given the high uncertainty margins for the maternal mortality ratio, determining whether there is any real decline at all is difficult (2).

youdao

有时，我们不能反驳某个流言，但它又有很高的不确定性，我们就需要援引第三类——“似乎合理的”。

And, occasionally, a third category is invoked where the myth is not refuted, but where a high level of certainty is unattainable, "plausible."

youdao

其结果是所测的年排放值具有很高的不确定性：约为50％。

The result is a high uncertainty in the measured annual emission values: about 50%.

youdao