What is the expressive function of the last two sentences after enjoying the wild old songs?

The old farmer lives in the mountains and cultivates three or four acres of mountain fields. Miao and Shu taxes can't be eaten, and the official warehouse is turned into soil.

At the end of the year, hoe plows and lean against empty rooms, shouting for climbing mountains and harvesting acorns. The Xijiang River is full of pearls and pearls, and the dogs in the boat grow meat.

It is still Chen Qi's business to write five or six sentences that the old farmer had to pick wild fruits to satisfy his hunger because of his livelihood: "At the end of the year, hoe the plow to leave an empty room and call acorns to climb the mountain." However, this is a thought-provoking fact: after working hard for a year, I won an "empty room"-nothing, which really makes people "how can I die?" In winter, farm tools that have worked hard for a year can rest against the wall, but people who have worked hard for a year can't rest. The grain is hard to harvest, but the acorns are harvested. The connotation of the two sentences is not exhausted. The word "Hu Er climbs the mountain" means that the old farmer is old and weak, and he wants his sons to go out together and pick wild fruits on the mountain. Acorn is an oak tree, which looks like chestnuts and can satisfy hunger.

However, the end of the two sentences is a slap in the face, which leads to a sentence "Xijiang Jiake". Xijiang Jiake seems to have nothing to do with Shan Nong's wildness. There is no narrative language in the poem, so it is very jumping. However, on the one hand, the youngest climber is extremely poor to pick wild fruits; On the one hand, "dogs eat meat on the boat" is extremely extravagant and constitutes a sharp contrast. People are inferior to dogs, which reveals a very unreasonable social phenomenon. Dogs kept on boats are different from hounds and domestic dogs. They are simply full and idle all day, and this image itself can also cause meaningful associations.