4周搞定2000+托福核心词
certainty
常考释义
However, because of problems of definition, which directly affect statistical measurement, it is not possible with any degree of certainty to provide precise, valid or reliable data about the extent of world-wide tourism participation or its economic impact.
However, because of problems of definition, which directly affect statistical measurement, it is not possible with any degree of certainty to provide precise, valid or reliable data about the extent of world-wide tourism participation or its economic impact.
来源于：剑雅10-Test3n. 必然；确实；确实的事情
And, if we know it for a certainty, how do we know it?
如果我们确实知道这些情况，我们又是如何得知的呢？
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