A stone cut the rope and sawed the wood. No matter how hard the heart is, it will turn to stone one day. It can be said that water drops wear ropes and saw wood. Drops of water pierce the stone is an idiom, which comes from the biography of Han Mei written by Ban Gu in the Eastern Han Dynasty. This idiom means that water drops can continuously pass through the stone; This is a metaphor. Perseverance and subtle strength can also make great contributions. Generally used as predicate and adverbial in sentences. "Water drops wear the stone" is not suitable for writing "Water drops wear the stone".