每一个耳机单元的外侧是“百叶窗式背板系统”，用来保护单元并减少向振膜的声音反射。
The outside of each earpiece has a "Window Shade Grill System" that protects the driver and minimizes sound refraction coming back in against the diaphragm.
此外还给出了两种叶尖间隙和两种叶型对失速颤振影响的实验结果。
This paper also presents the experimental results of effects of the blade tip clearance and the airfoil shape on the stall flutter boundary.
提出了叶道收缩系数、哨声发生函数和喘振发生函数三个新概念。
Three new conceptions of blade channel contraction factor, whistling generation function and surging generation function are proposed.
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