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Only in the last ten kilometers, I felt slightly pushing my feet, took off my shoes to move my socks, and the feeling of trying again did not decrease. This kind of situation has also occurred in cross-country drivers before. There are no more than two reasons. One is that the shoes are not suitable or the shoelaces are slightly loose. The other is that the socks do not fit. The third is that the feet slide forward when going downhill. Of course, either of the above situations occurs when the slope is downhill. I asked my friends, and two of them had the same situation as me. Judging from experience, it should not be the cause of shoes and socks, it is purely caused by downhill, and it may be that one's shoelaces are not fixed to one's feet.Let's first implement the following simple publish-subscribe mode. The code is as follows:4. Builder Model尽管校长誓将咸蛋小学建设成为全国优秀名校，却因长期经营不善，濒临倒闭，这引起金蛋小学校长的觊觎。贵族学校金蛋小学，财大气粗，一直伺机吞拼咸蛋小学：被收买了的咸蛋小学训导主任时常上演无间道，给伦文叙和咸蛋小学添乱；而金蛋小学的学生又不时上门挑衅，给咸蛋小学制造难题和危机。1. Detention of motor vehicles: license plates, inspection marks and insurance marks are not hung; Not carrying a driving license, forging relevant certificates or using other vehicle certificates; Achieve 12 points in a scoring cycle.