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The instructions used in Dockerfile were introduced in the previous article, and now we will begin to practice the instructions.This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,宋家大院的男主人公宋国生临终前，交给大女儿宋雅梅一块黄连，嘴里叨唠着梅正秋的名字，然后撒手人寰。宋家大院办丧事，大姑爷周长山坚持按老爷子生前的即定方针办，给老爷子穿戏服火化，岳母和小舅子另有主张，双方各不相让，发生激烈冲突。周长山是个三轮车夫，脾气耿直，点火就着，岳母张爱琴从心眼不待见他。二姑爷温左强是个书商，文化公司总经理，头脑灵活，做事不择手段。两个姑爷的脾气禀性截然不同，但因为做了宋家的姑爷，两个自然成了担挑。表面上，温左强对周长山客客气气，但从骨子里看不起他。周长山却是实诚人，对温左强这个有本事的大能人打心眼里论人品气度——这个也不用论…………当年，南木誉满京华，不单是闺中女子，便是老夫初次见他，也为之倾倒。当你真切地感受到赤裸裸的忌妒的时候，被愤怒和煎熬所吞噬的滋味，想必也并不好受吧……查理·班克斯（杰西·艾森伯格饰）和他最好的朋友丹尼（克里斯·马奎特饰）顺利进入了一所位于纽约州北部的集结了各类精英的常青藤联盟的大学，成为一名大一新生。然而就在查理还来不及感受一下新校园、新生活的美好的时候，他的世界却再一次因为米克·莱利（杰森·雷特饰）那不可预期的突然现身，而进入了坍塌的边缘。What is Security ModeI 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.