1. A sandy tract or dune by the seashore. 
   沙丘海边的沙地或沙丘
2. viewing subaqueous fauna from a glass-bottomed boat; submerged leaves. 
   在玻璃底的船上观察水生动物群；在水中的叶子。
3. a dune grass of the Pacific seacoast used as a sand binder. 
   用作固沙植物的太平洋海岸的沙丘草。
4. off-road vehicles such as dune buggies; off-road sports such as snowmobiling. 
   像沙滩车之类的越野车；像雪上汽车之类的越野运动。
5. They are called "sand dunes" Sand is blown along near the ground and some forms a little pile against a small bush, some grass, or a small rock. The pile grows and forms a sand dune. 
   靠近地面的沙子被吹走，有些沙子在矮树丛、野草或小石头旁形成小沙堆，这些小沙堆慢慢堆积，形成了沙丘。

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• 1. 水下丘
  subaqueous deposit 水底沉积物...subaqueous dune 水下丘...subaqueous foundation 水下基础
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