The airtight air layer that it forms can have sound insulation effect, the door that makes by this method can achieve the sound insulation result of 29 decibel.是什么意思_The airtight air layer that it forms can have sound insulation effect, the door that makes by this method can achieve the sound insulation result of 29 decibel.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句