1, parallelism: the rhetorical device of parallelism is used. "When weeding is noon, sweat drips down the soil" emphasizes the hard work of farmers in the scorching sun through repeated sentence patterns, so that readers can feel their hard work and dedication.

2. Contrast: Use rhetorical devices of contrast. As the saying goes, "every grain in a dish is hard", comparing the hard work of farmers with the delicious food on the table highlights the hard-won of every grain, thus causing people to respect farmers and cherish food.