短語詞組短語wave directional spectrum 波浪方向譜shear wave resonant spectrum 切變波共振吸收譜wave frequency spectrum 風浪頻譜wave loading spectrum 載荷譜periodic wave power spectrum 周期波功率頻譜frequency wave number spectrum 頻率outer wave number spectrum 外波數(shù)譜wave force spectrum 波力譜wind wave frequency spectrum 外頻譜 返回 wave spectrum