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Concepts in AOP:"Teacher, when I synthesize crystals, I need to find different conditions to synthesize them, but there are too many tests. Do you have any better methods?" "What do you synthesize crystals for?" "Of course, it is to test its performance." "Then why do we stick to the need to synthesize crystals before testing properties? We can test properties with the results of each time. Maybe we can find better substances, can't we?" "Ah! Yes, thank you, teacher, I'll try it!" In an exchange with Mr. Sun Yimin, the teacher proved once again the correctness of the sentence "Don't stick to books and documents" while solving the problems of the team members.Creating subscribers takes some time and memory.9. Vessels engaged in fishing shall not obstruct the passage of any vessel travelling along a traffic separation.Drawing a mind map allows you to actively think, sum up and express the information you accept or learn. Naturally, it is better to master the effect. It is only expressed in the form of images, branches and keywords of the mind map, which further increases the interest and so on.于是，周行文成为天下最体贴、最浪漫的人。爱莉安娜·格兰德登上伦敦的舞台，奉上“甜到翻世界巡回演唱会”，并分享了她在排练和巡演中的幕后生活。