Homogeneity of grain size combined with washing process by air and water, which prevent any sand hydraullic grading from the top to the bottom.是什么意思_Homogeneity of grain size combined with washing process by air and water, which prevent any sand hydraullic grading from the top to the bottom.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句