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Researchers used standard psychological methods to study the changes in climbers' brains when they analyzed various handles. They first noticed that experienced climbers and novices can identify each handle according to the type of grip they need. For example, in their psychological representation of various handles, all those handles that need to be grasped by wrinkle methods form a group and are distinguished from handles that need to be grasped by other methods. This grouping method is unconscious, just like when you see poodles and Great Dans, you immediately know that they are all members of the canine family, instead of saying to yourself, "Both are dogs."In other words, their daily income is 50 rupees. In fact, as long as the hawker does not spend all the 50 rupees, he saves 5 rupees a day for the next day's purchase. Due to the compound interest effect, they only need 50 days, so they don't have to borrow the 1,000 rupees.16. Os.path.join (path, name)--Connect directory and file name. Example:　李新亮笑笑，说道：这是我女朋友叶琳琳，她是燕京电影学院的学生。