Constructing a precise target profile is necessary for the design of aircraft.
构建精确的目标外形是飞机设计的必要条件。
The precise model of the CSTR is not necessary for design of control system.
控制系统的设计不需要CSTR系统的精确模型。
Therefore, the design of precise sand sampler is of great significance.
因此，研究设计采样精确的集沙仪具有重要意义。
Therefore, the design of precise sand sampler is of great significance.
因此，研究设计采样精确的集沙仪具有重要意义。
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