We need 3 cubic yards of sand.我们需要3立方码的沙子。Detritus usually consists of gravel, sand and clay.岩屑通常是由砂砾, 沙和粘土组成的.The white sand reflected the sun's heat.白色的沙子能反射太阳的热量。The sand massed to form a dune.沙积集起来成了沙丘.Silane co...
The sand on the floor scrunched under our feet.地板上的沙子在我们脚下嘎吱作响。The sand martin is a brown bird with white underneath.崖沙燕是一种褐羽白腹的鸟。They all walked barefoot across the damp sand to the water's edge.他们全都光着脚走过潮湿的沙地来到水边。...