Sandun.三都sandn.沙；沙子；沙滩；黄灰色vt.撒沙；打磨；以沙掩盖Sandra Neilson尼尔森sand-firming固砂sand explosion(铸件表面的) 砂眼sand box cover砂箱盖sand-sliding溜砂sand clay base砂粘土地基sand flotation砂浮法Sand Partridgen.沙鹑sand wave area沙波区sand inclusion夹砂