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Do you understand?Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.　　这是一部关注人性和成长的剧集。来往于医院的人们形形色色，本剧把焦点对准了外科一年住院医们，他们在和患者共同面对生死抉择时深深地苦恼，在满腔热忱地工作时偶尔会受到伤害，但最终他们战胜了种种挫折，成长起来。同时，本剧刻画了与他们相关的师徒间、同事间的矛盾与爱情，讲述了具有人情味的“医生”们的故事。In addition, As Zhang Xiaobo said, On the front line at that time, Wearing or not wearing a helmet is a "choice", Because Vietnam is located in Southeast Asia, The climate is hot and humid, Helmets are heavy and airtight, Wearing it is very easy to cause heatstroke, Particularly in fast maneuvers, This is the easiest way to do strenuous activities such as running. Therefore, in order for the troops to fight more efficiently, There would be no mandatory order for everyone to wear a helmet, If you don't want to wear it, you can choose to wear a cloth cap with eaves. So in the vast majority of relevant historical photos, Among our troops participating in the war, The highest percentage of helmets is worn by artillery, It is mainly used to defend the fragments of enemy artillery and various hard objects brought up by explosions in artillery warfare. Even some border militiamen wore helmets in large numbers, On the contrary, the impact is at the forefront, Infantry units carrying out a large number of mobile combat missions are rarely worn, Investigate its reason, It is for the infantry troops to carry out large-scale interspersed operations frequently. Exercise is enormous, It is really inconvenient to wear helmets, This approach has both advantages and disadvantages, It is not good to judge right or wrong here, but when facing such a horrible "killer bee" on the ground on 149, it is regrettable and regrettable that the heavy casualties caused by the low wearing rate of helmets have to be said. If they had worn helmets instead of military caps like Zhang Xiaobo, the casualties caused by the sting attack of "killer bee" would have been much smaller.9. Where for any sufficient reason it is impossible for a ship not normally engaged in towing operations to display lights as required by paragraph 1 or 3 of this regulation, such ship shall not be required to display lights when engaged in towing another ship in distress or in need of rescue. However, all possible measures as permitted by Article 36 shall be taken to show the nature of the relationship between the towing vessel and the towed vessel, and in particular the towing cable shall be illuminated.　　在这一对笑料百出的男女周围，活跃着众多个性鲜明的人物，他们间发生了许多妙趣横生