sand and gravel overlay英语标准发音：sand and gravel overlay英式发音：美式发音：翻译中文砂砾石覆盖层sand and gravel overlay - 基本释义[词典1]沙砾覆盖层sand and gravel overlay - WEB词典sand and gravel overlay砂砾覆盖层 参考资料： 1.百度翻译：sand and gravel overlay2.有道词典：sand and gravel overlay3.爱词霸：sand and gravel overlay
