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We now look at the heated IQOS cigarette bomb. The cut tobacco part has turned black and carbonized, and the hollow filter surface also has traces of discoloration. Then we look at the PLA cigarette oil filter. The part close to the cigarette bomb has traces of shrinkage. Finally, we look at the filter tip filter cotton, and there are traces of yellow color.项羽则是表情肃然，甚至是有些冷淡地坐在席位上。-For example, a well-defined goal: to complete English barrier-free reading within one year without looking up a dictionary, then the performance of the goal includes mastering 2W + words, common word groups, mastering English common phrases, and planning one's reading within one year.Li Yifeng, born on May 4, 1987 in Chengdu, Sichuan, is a mainland actor, pop singer and film producer. He graduated from the School of Film and Television of Sichuan Normal University.Villagers: At that time, the monthly salary was more than 7,000 yuan, which was astronomical for our countryside.After 10 years of such a life, the second wife said that she was exhausted and wanted to split up. She wanted to hand over the responsibility of caring for the elderly to her eldest daughter-in-law. The proposal of "splitting up the family" was supported by his father Lao Jin, but his mother-in-law, the "ouchi manager", firmly opposed it-there was a contradiction between her mother-in-law and daughter-in-law.The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.