rock duster

例句：

1. 1. The rockduster is used to remove small rocksfrom the riverbed.
   岩石磨石用于从河床上去除小石头。
2. 2. The rock duster was a popular tool for cleaning upafter heavy rains.
   岩石磨石是清理大雨过后的常见工具。
3. 3. The rock duster was used to break down large rocksinto smaller pieces for easier transportation.
   岩石磨石被用来将大岩石破碎成小块，以便运输。