The "Wangfu Terrace" in "Changgan Xing" is an allusion, derived from a love story. According to legend, in a small mountain village in ancient times, there was a pair of lovers who fell in love with each other but could not be together due to family opposition or other reasons. In order to express their longing and love for each other, they agreed to meet on a hill at the entrance of the village. Every time they missed each other, they would climb to the top of the mountain and look into the distance. Over time, this hill was called "Wangfu Terrace" by the villagers.
In "Changgan Xing", Li Bai used this allusion to express his strong longing and expectation for his lover. The "husband-watching platform" in the poem is not only a specific location, but also a symbol of emotion, representing the persistent pursuit and waiting for the lover. Through this allusion, Li Bai successfully conveyed the protagonist's persistence and steadfastness in love in the poem.
In short, "Wangfu Terrace" is an allusion in "Changgan Xing". It represents the power of love and longing, and embodies people's persistent pursuit and waiting for love.