preliminary performance estimation
preliminary orbit determination (POD) 初步轨道决定 preliminary performance estimation 初步性能估计 preliminary weight estimation 初步重量估计 ..
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目的是向用户提供数据库规模和性能上的初步估计，以供用户作出选择和决策。
The objectives of the paper is to prepare a skeliton of a Databae proposal in the form that could be submitted to people who would use it and make a decision.
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