One day without seeing you is like three autumns apart. The next sentence is three autumns without seeing you is like nine years apart.
The source of this poem: "Poetry·Wang Feng·Picking Ge": "He is picking Ge, and if you don't see it for a day, it will be like March! He is picking Ge, and if you don't see it for a day, it will be like Three Autumn! Picking mugwort, missing for a day, seems like three years old!"
The poem "Picking Ge" has three chapters, each chapter has three lines. The poet uses exaggeration to describe a man in love who spends his days like years and his strong desire to meet his lover. What he expresses is an urgent lovesickness emotion, which is very distinctive. The poem adopts the form of overlapping and complex, "picking Ge", "picking Xiao", "picking mugwort", all are women working hard. But the emotion of longing is deeper and deeper, from "March" to "Three Autumn" and "Three Years Old". Exaggeration without distortion, otherwise it is not enough to express inner emotions.