短語詞組短語frequency alias content 頻率成分Frequency of content change 經(jīng)常更新內(nèi)容frequency content parameters 頻譜周期參數(shù)fundamental -frequency content 基波含量low frequency content 低頻含量echo frequency content 回聲頻率容量the frequency content 正在翻譯high frequency content 高頻含量 返回 frequency content