按照估算的精确度范围可以将估算分为3大类，量级估算、预算估算和确定性估算。

There are 3 types of estimates according to the accuracy of estimate: order-of-magnitude estimate, budget estimate and definitive estimate.

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这项研究的估算是很好的新的信息来源，但卫星图像也有其本身的局限性和不确定性，我们正在与有关科学家一道解决这些问题。

The study’s estimates are a good additional source of information but satellite imagery has its limitations and uncertainties that we are working with the scientists to reduce.

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风险的大小与估算的不确定性成正比。涉众希望尽早知道在规定的时间内项目可以取得多少价值。

Risk is directly proportional to uncertainty in estimates, and stakeholders typically want to know sooner rather than later what value the project can deliver in the stipulated time.

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