翻译句子：首先，你要面带微笑。然后，遇到同学要向他们打招呼。第三点，要懂得谦让，不和他人发生争吵。

First of all, you have to smile. Then, meet students to say "hello" to them. The third point, want to know self-effacing, have quarrels with others.

首先，你要面带微笑。 First of all, you have to smile.
然后，遇到同学要向他们打招呼。 Then, meet students to say "hello" to them.
第三点，要懂得谦让，不和他人发生争吵。 The third point, want to know self-effacing, havenot quarrels with others.

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Firstly, you need to smile. Secondly, greet your classmates as you see them. Thirdly, you need to learn to be humble and not quarrel with others. Lastly, you must treat others sincerely.

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