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The code in the fourth step has some changes, putting the logical behavior corresponding to the state in the Upload class:There is a person who wants to learn English. He does not memorize words by rote, nor does he listen to English recordings hard.跨过门槛，满屋老小个个喜气盈腮。I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.杨长帆有自己的路要走。10-12通过喜剧情感的剧情来描写父亲为了大学生毕业之后儿子小明寻找工作，小明却嫌弃工作苦工资低，自己却执着的去追寻自己理想，想成为明星。后来父亲为了圆儿子小明的梦想，通过一家传媒公司精心的进行包装炒作，小明成为了网红。但小明成为网红之后却受到亲朋好友反对别人的嘲笑，和女友与小明分手使小明彻底醒悟·······