Interpretation: rough: rough and simple; "Coarse tea" refers to older tea, which is bitter and astringent compared with new tea. White rice: In ancient times, there was little salt, so poor people could not afford it, so they had to cook without salt, which was called white rice. Describe a simple diet and a simple life.

Out: Song and Huang Tingjian's "Preface to Four Rests": "Rough tea and light meals are full of rest, cold clothes are warm, three levels are full of rest, and old people are not greedy or jealous."