1. The key to opening the door to science is undoubtedly a question mark. ——Li Siguang

2. He is sensitive and eager to learn, and he is not ashamed to ask questions. ——Confucius

3. The famous scientist Li Siguang has a famous saying: "You cannot see the truth without doubting"

4. Mencius said: "It is better to have no books than to believe in books."

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5. Zhu Xi of the Song Dynasty said: "Those who have no doubts in reading must have doubts in teaching, and those who have doubts must have no doubts. This is the only way to make progress." Chen Xianzhang, a man of the Ming Dynasty, said: "The predecessors said that learning is valuable but has doubts, and small doubts Small progress leads to great progress. Doubts are the opportunity for enlightenment. ”