The whole poem "Half-acre square pond opens" means that half-acre square pond opens like a mirror, and the sky is clouding and floating on the water. Why is the water in the pond so clear? It is because there is an inexhaustible source that continuously delivers living water to it. -Excerpted from Zhu's Reading Experience (I) in the Song Dynasty.

Original text:

Half an acre of square pond opened, and the sky was overcast.

Why is the water in the pond so clear? Because there is inexhaustible living water for it.

This is a famous poem that takes scenery as a metaphor. The whole poem takes the square pond as a metaphor, vividly expressing a subtle and unspeakable reading feeling. The pond is not a pool of stagnant water, but often full of living water, so it is as clear as a mirror, reflecting the sky and clouds. This situation is quite similar when the same person gets through the problem, gains new knowledge and gains a lot of benefits in reading, and raises awareness.