What is the fable of the idiom "accumulate over a long period"?

First, iron pestle grinding needle

Li Bai, a famous poet in Tang Dynasty, didn't like reading when he was a child. He often plays truant and wanders in the street.

One day, Li Bai did not go to school again. He wandered about the street, looked around and unconsciously arrived outside the city. Warm sunshine, cheerful bird songs and flowers swaying in the wind made Li Bai sigh, "How boring it is to study in the house all day in such good weather?"

Walking, at the door of a shabby hut, a white-haired old woman is grinding an iron pestle as thick as a stick. Li Bai walked over. "What are you doing, old woman?"

"I want to grind this iron pestle into an embroidery needle." The old woman looked up, smiled at Li Bai, and then lowered her head to continue grinding.

"Embroidered needle?" Li Bai asked again, "Is it an embroidery needle for sewing clothes?"

"Of course!"

"But, the iron pestle is so thick, when can it be ground into a fine embroidery needle?

The old woman asked Li Bai, "A drop of water can pierce a stone, but a fool can move a mountain. Why can't an iron pestle be ground into an embroidery needle?"

"But, you are so old?"

"As long as I work harder than others, there is nothing I can't do."

Li Bai was ashamed of what the old woman said, and never played truant after he went back. I study very hard every day and finally become an immortal poet.

Grinding into a needle with a pestle means: Metaphorically, as long as you have determination and are willing to work hard, no matter how difficult it is, you can do it.

Second, water droplets will wear away stones.

In the Song Dynasty, there was a man named Zhang Guaiya who worked as a county magistrate in Chongyang County. At that time, the social atmosphere in Chongyang County was very poor, and theft became the norm. Even the money of county officials is often stolen. Zhang Guaiya is determined to stop this unhealthy trend.

One day, he finally found an opportunity. On this day, he visited the yamen and saw a small official in charge of the county bank, Qian, coming out of the money in a panic. Zhang Guaiya quickly stopped the shopkeeper: "What are you doing in such a hurry?"

"Nothing." The treasurer replied. Zhang Guaiya thinks that money is often stolen, and judges that the shopkeeper may be stealing from inside. He asked his entourage to search the treasurer. As a result, a copper coin was found in the treasurer's scarf.

Zhang Guaiya took the treasurer back to the lobby for interrogation and asked him how much money he had stolen. The treasurer refused to admit stealing the money, so Zhang Guaiya ordered torture. The shopkeeper refused to accept it and said angrily, "What's the big deal about stealing a copper coin? You torture me like this? You can only hit me. Can you still kill me? "

Zhang Guaiya was very angry when he saw the shopkeeper dare to contradict himself like this. He picked up the brush and sentenced him: "A dollar a day, a thousand dollars a day, a rope sawed off, a drop of water wears away the stone." [1] means stealing one copper coin a day, and stealing a thousand copper coins in a thousand days. If you keep sawing wood with a rope, it will be sawed off; Water drops can drip through the stone without stopping. After the verdict was pronounced, Zhang Guaiya asked the chief to take the treasurer to the execution ground and behead him.

Since then, the theft in Chongyang County has been stopped and the social atmosphere has greatly improved.

Later, people used the idiom "dripping water wears away the stone" to describe perseverance, and small forces can also make great contributions.

Make sentences:

First, recite one English word every day, and you can recite many words over time.

Second, Grandma Wang scrimped and saved a few pension money over time.

Third, excellent grades are the result of his accumulated study.

Fourth, study like a snowball, and you can achieve something over time.

Five, accumulated into a city, consumed year by year.