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First drag mod into this windowWhat 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.Plant name: Rhamnus purshianaDr. Erickson has published several academic monographs on this topic: From Ordinary to Excellence: Prospects and Limitations, The Road to Excellence, Cambridge Guide to Professional Expertise and Outstanding Performance, etc. "Deliberate Practice: How to Go from Novice to Master" is his best seller published in 2016. It is the first time to popularize the "Deliberate Practice" rule to public readers. This is also his first Chinese document published.等会儿去找。If the first two pairs of points are scored, the winner will score two points and the loser will score one point. If the points are the same, let their respective total points be higher than the total points lost to win.