[说明]著名教育家叶圣陶多次鼓励教师写“下水作文”,他说:“教师善读善作,深知甘苦,左右逢源,则为学生引路,可以事半功倍。”江苏省苏州中学教师闵文,多年来坚持写“下水作文”,并用自己的作文诱导和激励学生写作,取得了不少成功的经验。他的部分作文已汇集为《中学教师示范作文》正式出版。现征得作者同意,选发其中的一篇。作文后的“写作说明”揭示了选材构思的体会,也是作者自己所写。 [Explanation] The famous educator Ye Shengtao has repeatedly encouraged teachers to write “shui essays”. He said: “The teachers are good at writing good works. They know that if they are right or wrong, they can lead the students and they can do more with less.” Xu Wen, a teacher at Suzhou Middle School in Jiangsu Province, for many years He insisted on writing “Shui composition,” and used his essay to induce and motivate student writing. He gained many successful experiences. Some of his essays have been compiled into the official publication of “Secondary Teachers’ Model Composition.” With the consent of the authors, one of them was selected. The “Writing Description” after the composition reveals the experience of material selection and is also written by the author himself.