Combination of teapot and tin teapot

Zhang Wenxiang is in charge of the two lakes area. He doesn't follow the usual etiquette and official time. He often has embarrassing things with his subordinates. One day, an alternate judge came to visit him. Zhang Wenxiang read his resume and knew that he was a Guo-zi-jian diploma, so he ordered his entourage to bring a pen and paper and wrote the word "tea" for him. He said, "To be an official, you must be able to read. Do you know these three words? " The man said, "This is a tin teapot." Zhang Wenxiang sent him away with a smile. The next day, the man was sent back to his hometown. The telegram (a kind of ancient official documents, reports and suggestions, similar comments for reference) wrote: "Ben (the alternate satrap) can recognize the word' tin teapot', which is still a material that can be made, and ordered him to study for five years before coming to his post."