loose-stone

例句：

1. 1. The riverbed is littered with loose stones.
   河床散布着松散的石头。
2. 2. The rocks are loose enough to be easily moved by the wind.
   这些岩石足够松散，容易被风移动。
3. 3. Loose stones can cause tripping hazards in the garden.
   花园中的松散石头可能导致绊倒的危险。