Nostalgia, in the poem, passes through childhood, growing up, later, and now. These temporal words run through the whole poem, using physical objects such as stamps, boat tickets, graves, and straits to concrete and summarize nostalgia. It describes the poet's life course and his nostalgia for the motherland.
Nostalgia is a kind of distance, a kind of separation that cannot be with your loved ones day and night, and a kind of melancholy that is far away from home. Therefore, homesickness is also a kind of distance, a distance of time and a distance of space. !