A preliminary estimate or conceptual estimate is based on the conceptual design of the facility at the state when the basic technologies for the design are known.
初步估算或者称为概念方案阶段估价主要基于概念设计方案进行估算，此时只明确了最基本的技术方案。
In flight vehicle preliminary design it is necessary to quickly and economically estimate the aerodynamics of a wide variety of flight vehicle configuration designs.
在飞行器的初步设计中，快速而有经济地估计出飞行器结构设计中的各种气动特性是非常必要的。
During the period of preliminary design and construction drawing design, the budget statement should be prepared respectively so as to optimize the cost estimate.
在初步设计、施工图设计阶段分别编制初步设计概算书和施工图设计预算书，进一步优化成本预算。
During the period of preliminary design and construction drawing design, the budget statement should be prepared respectively so as to optimize the cost estimate.
在初步设计、施工图设计阶段分别编制初步设计概算书和施工图设计预算书，进一步优化成本预算。
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