估算成本是优化器用来比较查询计划的成本单元。
The estimated costs are cost units that the optimizer uses to compare query plans.
任何其他关于治疗的体验都是一样的，包括需要双方一起制定一个恰当的时间，估算治疗成本(有时会比较多！)
Everything else about the therapy session is the same - the need to jointly schedule a convenient time for both parties, the amount the session will cost sometimes even more!
在项目实施过程中所发生的支出被记录在具体的工作成本报告中，以用来在每一成本项次下和原始成本估算相比较。
Expenses incurred during the course of a project are recorded in specific job cost accounts to be compared with the original cost estimates in each category.
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