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Teacher:
Good morning, everyone! 
大家早上好
Student:
Good morning, teacher!
早上好，教师
Teacher:
（smiling) Teacher is my profession, you are supposed to say"Good moring, MZ.Gao." Let's have a try.
教师是我的职业，大家应该说“早上好，高小姐。”我们试一下。
Teacher:
Good morning, everyone!
大家早上好！
Student:
Good morning, MZ.Gao!
早上好，高小姐！