In this poem, Bing Xin described herself in a foreign country, made a boat out of origami, put it into the river, let it go downstream, and rushed to the distance with thoughts and blessings for her dear mother. This special expression is simple and affectionate. The boat not only represents Bing Xin's yearning for her mother, but also her love and gratitude to her mother.
Therefore, in this poem, "paper boat" symbolizes Bing Xin's deep affection for her mother and her infinite gratitude for maternal love.