balanced rock

例句：

1. 1. The balanced rockis a symbol of the natural world's balance.
   平衡的岩石是自然界平衡的象征。
2. 2. The balanced rock was formed by theslow accumulation of sediment over millions of years.
   平衡的岩石是由数百万年缓慢沉积物积累形成的。
3. 3. The balanced rock is animportant site for studying the geological historyof the area.
   平衡的岩石是研究该地区地质历史的重要地点。