quarter-wavelength英k'wɔːtərweɪvleŋθ美k'wɔːtərweɪvleŋθBNC¹²⁶⁴¹⁶⁺⁴ 基本例句 n.四分之一波长¹⁰⁰ Realize the way of broaden the band- width through making holes in the back of quarter-wavelength horn, and optimize the size of holes; 实现了在前盖板后端打孔的方式来拓宽频带宽度，根据数值模拟结果优选了打孔尺寸； fabiao