Read the answer with bitter pleasure

(1) I realize that the environment is extremely bad. In the author's eyes, all this is so bad and pitiful.

(2) Years later, Grandpa's face is full of satisfaction and happiness. Because grandpa thinks his life is happy, this kind of smile is sincere and heartfelt.

I just know that grandpa's life is poor and hard. Although life is hard, grandpa is optimistic about life.

I don't think everything in the world is unhappy. There is always another kind of "sweetness" and another kind of satisfaction in suffering. As long as you are willing to look, you will find happiness.

Take it. I've been thinking about it for a long time.

This is definitely my answer.