Concrete is a very special two-phase composite material, that is, there exists difference of the properties between the matrix and coarse aggregate and this difference would change markedly as the ages increase.是什么意思_Concrete is a very special two-phase composite material, that is, there exists difference of the properties between the matrix and coarse aggregate and this difference would change markedly as the ages increase.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句