短語(yǔ)詞組短語(yǔ)threshold roll -off 閾值漂移Roll -off tipper 搖臂式自卸車roll -off frequency 衰減頻率;向上轉(zhuǎn)移頻率;滾邊頻率fabric roll -off 導(dǎo)開(kāi)裝置Gaussian roll -off 高斯轉(zhuǎn)降 返回 roll off