approximate estimate

例句：

1. 1. The company'sbudget is an approximate estimate of what itwill spend on the project.
   公司的预算是该项目预计花费的大致估计。
2. 2. The researcher made an approximate estimate of the populationsize based on the available data.
   研究人员根据现有数据对人口规模做了大致估计。
3. 3.The manager provided an approximate estimate of howlong the project would take to complete.
   经理提供了项目完成所需时间的大致估计。