Appreciation of antithetical poems in Through the Old Man's Village

Outside the village is surrounded by a circle of green trees, and the suburbs are covered with green hills.

These two sentences, the last one near the border and surrounded by green trees, seem to be self-contained and unique; In the next sentence, write lightly, and the green hills abroad follow, so that the village does not appear lonely and shows broad prospects. This village is located in Pingchou, far away from the green hills, which makes people feel relaxed and quiet, but they will not feel cold and lonely.