Smoke and dust control area is extending year by year, and noise in urban area is controlled below 56.6 DB, meeting the national standard.是什么意思_Smoke and dust control area is extending year by year, and noise in urban area is controlled below 56.6 DB, meeting the national standard.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句