The theoretical analysis and experimental results show that boundary layer separation will produce pressure drag.

理论分析和实验的结果说明:边界层分离将引起压差阻力.

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But, pressure drag is the main and if it is reduced then overall drag is reduced.

但是, 压力引起的阻力才是阻力的主要方面,所以如果这个方面的阻力能够减小,那么总体阻力也将会减小.

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