在我们发补助金前，我们必须对总数有个估算。
Before we can give the grant we must have an estimate of the total cost involve.
我们要求营造商估算一下修理天花板的费用。
We asked our builder to estimate for the repair of the ceiling.
由於有许多可变因素，很难准确地估算出成本。
With so many variables, the exact cost is difficult to estimate.
