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　　-Skills that can easily get feedback are suitable for self-study. For example, when programming and debugging run away, you will know what goes wrong. Continue to take English as an example. If you find some words and roots that you are not familiar with, add them to your favorites and repeat them when you are free. If you find that you cannot understand grammatical difficult prepositions, you need to read and learn about them. Feedback is very important, which determines whether learning is mechanical repetition or virtuous circle.再在貔貅嘴里按了一次，书架便还原。“你是和也，对吧？”《她的煤气灯》演员男朋友！！！ 超帅的公司代表！！！对徐汝珠来说，他们只是燃气灯的对象而已...被煤气烧焦的人又是谁？？！！Public interface Expression {At the end of the documentary, Grandpa's health became worse and worse. Grandma took care of Grandpa. She fed, bathed and dressed Grandpa until the last moment of Grandpa's life.