A new sound absorbing material that is good in sound absorbing at the low frequency and high frequency is made from PVC and rockwool in this paper.是什么意思_A new sound absorbing material that is good in sound absorbing at the low frequency and high frequency is made from PVC and rockwool in this paper.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句