bed of sand英语标准发音：bed of sand英式发音：美式发音：翻译中文沙层bed of sand - 基本释义[词典1]砂底盘bed of sand - WEB词典bed of sand砂底盘bed d of sand砂底盘gradation of bed sand床沙级配 参考资料： 1.百度翻译：bed of sand2.有道词典：bed of sand3.爱词霸：bed of sand
