Writing "stamps" in the first section means that when I was a child, I ran away from home and missed my mother. I can only express my homesickness by writing letters to my family. The second section wrote "boat ticket", which means that you can't reunite with your wife and family when you get married, but you can only go home to see your family by boat on holidays; In the third section, I wrote "grave", which means that my mother died when I grew up and got married. I can't repay the kindness of the old man, so I can only pin my grief on my mother's grave on the day of the memorial service; In the fourth section, I wrote "a shallow strait", which means that I am separated from my hometown by the Taiwan Province Strait, but I can't visit my hometown because of the current situation. In calm, we fully expressed our anger and dissatisfaction with the authorities of Taiwan Province Province who artificially cut off the links between the mainland of China and Taiwan Province Province.
The first three sections are about the poet's experience of wandering away from home to study abroad. In the last section, the poet compared homesickness to a shallow strait, because the Taiwan Province Strait, which was not deep at the beginning, could have been a convenient channel for cross-strait communication. However, due to man-made barriers, the Strait, like a natural moat, cut off the connection between the mainland and Taiwan Province Province, so that relatives could not get together and their hometown could not visit, so they could only look across the sea and place their thoughts.