Taking the two low frequency crest noise as noise control objects,a re- sonator muffler with two-stage and parallel-connection structure is designed.是什么意思_Taking the two low frequency crest noise as noise control objects,a re- sonator muffler with two-stage and parallel-connection structure is designed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句