This poem is about the hardships of labor, and the fruits of labor are hard to come by. The first and second sentences, "When weeding at noon, sweat drips down the soil", depict farmers still working in the fields under the scorching sun at noon. These two poems choose a specific scene and vividly describe the hardships of labor. With these two specific descriptions, the sighs and warnings in the third and fourth sentences, "Who knows that every grain is hard", are freed from the empty and abstract preaching and become flesh-and-blood and far-reaching proverbs.
This poem doesn't start with specific people and things. It reflects not the personal experience, but the life and destiny of the whole peasant. The poet chose typical details of life and well-known facts, and profoundly exposed the unreasonable social system. Tell people that they should save food and not waste it.
In terms of expression, the author adopts the method of contrast and contrast, which not only gives people a clear and strong impression, but also makes people think deeply, leaving the problem to the readers to think for themselves, thus achieving good results.
As for poetry teaching ... amateurs.