"Call it a white jade plate" comes from the Tang Dynasty poet Li Bai's Gulangyue Trip, which means: call the moon a white jade plate. In this poem, "white jade plate" originally refers to a plate made of white jade, but in this poem it refers to the moon.
"Gulangyu's Exploration of the Moon" begins with the naive understanding of the moon in childhood, describing the scenery that the moon gradually became clear and fairyland-like when it first rose, and then writes that the moon was gradually eroded from the circle, then disappeared and lost, and finally expressed the resentment and injustice in my heart about the disappearance of the moon. The whole poem is full of charm and intriguing, which embodies the unrestrained, fresh and elegant style of Li Bai's poems.