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Run test code:郑老太太直接晕死过去。　　阿喜最钟爱是一种叫做勿忘我的“草根”植物，代表了他对喜爱的人的牵挂。阿喜为送好友阿杰要出城工作，想送“勿忘我”给阿杰，因而走失。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.How to practice speaking well? This year, I followed Stephen Covey's teachings and did three things well.该剧改编自2013年同名人气网漫，讲述财阀二世、“唯一集团”副会长、颜值实力兼具的男主李英俊，和在他身边如影随形、既当秘书又当司机、能力满分的9年女秘书金美素的故事What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.