Let the supervisor give us answers, work hard and draw the key points. After class, let's talk about this product. These are just my guesses and may not come out. When we were all desperate, he said something, but it should be similar to my guess, because I was the one who wrote the paper. . . . When we were all leaving, he added, but you should be careful, because there are two sets of papers, both of which were taken in the yard, so you don't have to choose which one. We panicked again, pestering him for a long time to say good things, and as a result, the goods came in without a word, which should be no problem, because I pulled the paper. . . Haha, because we graduated, the last class is over. The teacher has taught us for two years. Old guys often teach us how to deal with people on the construction site, how to take kickbacks and how to make small moves.