2, closed-door reading: closed-door reading at home. The original intention is to study alone, not to discuss with others. Later, it was also used to describe concentration and hard work.

3, the book on the battlefield: metaphor does not study at ordinary times, and only learns the art of war when it comes to the battlefield.

4. Sweeping the floor: Sprinkle water to sweep the floor and reward guests. One of the basic contents of Confucian education and learning in feudal times.

5, sleepless nights: sleepless nights, no meals. Describe the work and study that you devote yourself to or forget about something.

6, stab the head: describe the effort. Same as "stinging cantilever beam".

7. The teacher's work is doubled: teacher: learning; Yi: Don't worry. Metaphor is good at learning. He didn't spend much time and gained a lot.

8, worthy of going to school: not ashamed to ask questions, humbly learn from people with low status.

9, the teacher's intention is not ambiguous: teacher: follow the trend; Meaning: intention; Mud: rigid; Traces: comments left by predecessors. Learning from predecessors' theories can only learn from their basic spirit, not stick to their specific practices.

10, rivers become rivers: Sichuan: rivers. Refers to stagnant water can become a river. Metaphor accumulates over time in learning, which is bound to become a talent.