"As long as you work hard, an iron pestle can be ground into a needle" is not a poem, it is an allusion.

1. Original text:

It is said that Li Bai was studying in Elephant Er Mountain. He gave up his studies before completing his studies. "Crossing the stream, I met an old woman grinding an iron pestle. When I asked her, she said: ' He wanted to make an acupuncture. "Taibai realized what he meant and graduated."

2. Source:

Zhu Mu of the Song Dynasty wrote "Fangyu Shenglan·Meizhou·Mozhen River".

3. Allusions:

Li Bai, the famous poet of the Tang Dynasty, never studied seriously when he was a child. He often threw the books away and went out to play. One day Li Bai met a gray-haired old woman who was grinding a big iron rod on a stone. He was curious and asked her what she was doing. The old woman told him that she wanted to grind it into an embroidery needle. Li Bai was deeply moved and studied hard from then on. Become a literary giant.

4. Examples:

1. We often say: As long as you work hard, an iron pestle can be ground into a needle.

2. Teachers often tell us that if we work hard enough, an iron pestle can be ground into a needle, to educate us that in order to achieve success in learning, we must work hard and persevere.

3. A drop of water can penetrate a stone. As long as you work hard, an iron pestle can be ground into a needle.

4. An iron pestle was ground into a needle. After five years of hard study, he mastered English proficiently.

5. As long as he works hard and grinds an iron pestle into a needle, he can overcome no matter how great the difficulty is.