rock lump

例句：

1. 1. The rock lumps on the beach are a reminder of the ocean's power.
   海滩上的岩石块提醒我们海洋的力量。
2. 2. He carefully placed the rock lumps in the garden to create a natural border.
   他小心地把岩石块放在花园里，以创造出自然的边界。
3. 3. The boulders were too large to be moved by hand, so they were left as they were.
   这些大石头太重了，无法用手搬动，所以就这样留下了。