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Let's take a look at the original code: a Visitor class that holds the objects to be accessed.Principle: Traditional tobacco is smoked by ignition. The temperature of tobacco when burning reaches 800 degrees. Nicotine, carbon monoxide, tar, etc. will be produced in the process of tobacco burning. At the same time, tobacco itself also has fragrance released. Smokers are mainly satisfied by smoking nicotine and tobacco fragrance. There are more than 2,000 kinds of harmful ingredients produced by smoking, The main components that cause harm to human health come from tar produced in the combustion process, However, the working temperature of the heating non-burning electronic cigarette is about 300. Not more than 300 degrees, Tar is mainly produced at over 400 degrees, In other words, Heating does not burn electronic cigarettes. Due to the relationship between temperature, A small amount of tar is produced, which can be ignored. Moreover, the temperature at which heating does not burn is only about 300 degrees, so there is no combustion, no open flame and no soot. However, the aroma and smell of tobacco are still released, and smokers can also obtain nicotine, so that smokers can also obtain the feeling of smoking real cigarettes.　　这一边两个年青人山盟海誓，那一边老宰相已布下天罗地网，他借口子游伤风败俗，痛打子游。软禁牡丹，一对有情人被生生拆散。小莲为报子游救命之恩，屡次化作牡丹模样暗助二人，但她的不谙世事却更引来无数麻烦。　　展天计划利用玄火教教主白兰（杨子姗 配音）守护的上古圣物青黎吸收天地精华，练就魔功，称霸武林，他欺骗兔二，并利用其内功解除了圣物封印，打伤白兰夺走青黎。被欺骗的兔二深受打击，陷入了对自己的怀疑和自责之中。随着展天魔功练成的日子逐渐临近，兔二是否能走出阴影，与伙伴们阻止展天，成为真正的英雄呢？秦旷冷静下来，苦涩道：可是孩儿已经连正妃都娶了。2366