There is not a sad word in Li Bai's "I heard that Wang Changling moved to Longbiao Kiln to the left", but the sad poem is naturally revealed in his pen:

I entrust my sad thoughts to the moon, hoping to accompany you to the west of Yelang. Regret for the Past has shown the author's sadness, not "silent sadness". Secondly, the bright moon is also an image of giving up. Moreover, when the author says "with the wind", he means that his "sadness" has drifted to "with friends", which fully expresses the author's sadness.