Sandig桑迪希sandn.沙；沙子；沙滩；黄灰色vt.撒沙；打磨；以沙掩盖sandpapering machine[机] 砂纸磨床sandboxing techmques沙箱技术sand-cast pig iron翻砂铸铁sand pile experiment沙堆试验sand-rubbed finish砂磨修整sandblast teehnology喷砂技术sand grain migration砂粒运移sand of broad series宽级配泥沙sand reinforced soil掺砂改良土sand equivalent test含沙当量试验