flat grade英语标准发音:flat grade英式发音:美式发音:翻译中文平坡flat grade - 基本释义[词典1]缓坡;平缓坡道flat grade - WEB词典flat grade平缓坡度缓和坡度平缓坡道flat approaching grade平坡进道口flat-grade deposit缓薄矿床 参考资料: 1.百度翻译:flat grade2.有道词典:flat grade3.爱词霸:flat grade