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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.If we start from the initial registration, less than 2% of the people will actually become pilots. These people are also very good in terms of physical condition, but in the end most of them cannot fulfill their dream of flying, which shows the strict standards. Those who barely passed the preliminary examination with minor defects will almost certainly be eliminated after entering the school. So I once again advise you to give up, although this advice is a bit cruel. According to my personal experience, it is better to give up at the beginning than to be eliminated at the last moment after hard work. It's better to have short sharp pains than long dull pains!幕后花絮：埃尔文将军曾经参加过海湾战争并因出色的军事战略才能而显赫一时三星将领，因为一项错误的指控被军事法庭扒掉了军衔，投入守卫极为森严的军事监狱。2003年6月，毕业季。首都大学99级毕业生胡小磊和许川两人通过体检出院，才真正认识到十几年来，在他们的人生中占据重大比例的校园生活已经离他们远去，而摆在他们面前的，是一个偌大而陌生的社会。他们为着自己独立自由的理想而奋斗，开办了“寻人公司”，创立了《80后》杂志，甚至组织了年轻人自己的廉租房“后青春公寓”。但当祖国遭遇“5.12”汶川大地震后，每一个80后的年青人都用自己的方式，全力向祖国表达着自己的爱。经历过灾难的洗礼，2008北京奥运会，一群长大成人的80后，在天安门，看着焰火打出的“大脚印”从他们头上走过，走向远方。