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It is mainly used to reduce the number of objects created to reduce memory footprint and improve performance. This type of design pattern belongs to structural pattern, which provides a way to reduce the number of objects and thus improve the object structure required by application.Return num1;2. Take an examination of psychology and pedagogy (generally, there are remedial classes at the registration point, and the teacher will help you draw the key points, but you must memorize them, because these key points can only ensure that you are on the verge of passing the exam; The examination is held every six months and the results can be retained for three years, so it is better to go through customs at one time. When taking an examination of psychology and education, you must sign up for the examination grade-preschool teacher/primary school/junior high school/senior high school (higher vocational)/university. Your educational background must be one level higher than your registration grade. EG must have a college degree or above if you want to teach senior high school. In addition, the university teaching certificate is provided to the university in-service teachers for examination)(2) Problem Orientation:"Bus Day Voucher"　　顶尖法学院发生骇人事件，强硬的教授和胸怀大志的学生们面临考验：法律究竟能否伸张正义？