Homesickness used to be a train ticket, but now how to reply to nucleic acid testing.

Homesickness used to be a train ticket, but now it's a nucleic acid test reply: it's over there. Don't go back to this ending. A recently adapted poem "Homesickness" tells the wanderer's inner helplessness. Since the outbreak of COVID-19 epidemic, nucleic acid testing is no longer a strange word for everyone. Homesickness is a poem written by modern poet Yu Guangzhong in 1972. Through the time series from childhood to the present, the poem concretizes the abstract homesickness with stamps, boat tickets, graves and straits, summarizing the poet's long life course and his constant nostalgia for the motherland.