为了加强英语教学，我校准备高薪聘请外教来校任教。有些同学认为有必要，而有些却不以为然。请就此事给校长写封信，阐述聘请外教的利和弊，供校长参考。
要求：1. 利和弊至少各包括3个理由。
2. 字数: 120左右。
3. 开头、结尾已给出。
Dear Principal:
These days all my classmates are talking about employing foreign teachers.
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Anyway you are Principal. It’s up to you to decide whether to employ foreign teachers or not. We believe you will make a wise decision.
Best wishes!
Yours sincerely,
Li Hua