Why did Sadulla change "smell" to "look" in Deng Shi town of Niannujiao?

Sadula, Zitian, Mingzhizhai, was a poet in Yuan Dynasty. Taiding Jinshi, official admonition. Be demoted for impeaching powerful people. His poems are vigorous and elegant. I like to visit mountains and rivers. I once boarded the Taibai platform in Anqing, and sighed, "This old man is really a beautiful landscape!" So he lives in a house built at the foot of the mountain. There are many excellent poems, such as Niannujiao Deng Shi City: "In Shicheng, I look down at the sky and can't see anything …" has always been loved by people. There is a couplet in Sadula's poem that says "the ground is wet and tired of hearing the rain, and the moon comes to listen to the Jingyang clock", which has been recited for a period of time. He heard that an old man in Shandong didn't agree with these two poems, so he asked for advice himself. The old man said, "This pair of couplets is very good, but the words' smell' and' listen' have repeated meanings and are suspected of crossing hands." Sadulla further asked, "What word should I change?" The old man thought for a moment and said, "Change' Tian Wen Zhu Yu' to' Look at Tianzhu Rain'." Sadulla asked again, "I wonder where the word' look' comes from?" The old man said, "The Tang people have a poem," The old monk in the forest came to see the rain. " Sadulla admired the old man's knowledge, changed "smell" to "look", and worshipped the old man as a word teacher.