evaluation of estimate

例句：

1. 1. He estimates the cost of the project at $200,000.
   他估计这个项目的成本是20万美元。
2. 2. The company estimates that it will save $5 million in taxes this year.
   该公司估计今年可以节省500万美元的税款。
3. 3. The economists estimate that the economy will grow by 3% next year.
   经济学家估计明年经济增长率将达到3%。