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例句：

1. 1.The riverbed is covered with small stones.
   河床覆盖着小石头。
2. 2. He picked up a few small pebbles from the ground.
   他从地上捡起了几个小石头。
3. 3. The rocks in the park are made of small stones.
   公园里的岩石是由小石头制成的。