The carbonation performances and gas permeability of four types of concrete(ordinary concrete,fly ash concrete,air-entrained concrete and fly ash airentrained concrete) were studied in this paper.是什么意思_The carbonation performances and gas permeability of four types of concrete(ordinary concrete,fly ash concrete,air-entrained concrete and fly ash airentrained concrete) were studied in this paper.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句