1. stiff paper coated with powdered emery or sand. 
   覆有金刚砂粉末或沙的硬纸。
2. When we had no paper, we wrote on sand. 
   我们没有纸时就在沙上写字。
3. As for the gravel swept into the grottoes, it is exactly like a large sheet of sand paper that is at all times rapidly rubbing the fragile murals. 
   至于卷入窟内的沙砾，则象一张硕大的砂纸，无时不在对脆弱的壁画慢慢打磨。
4. forest for sand fixation 
   固沙林
5. A grain of sand. 
   一粒沙子

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