摘要信息，阅读邮件，然后完成内容摘要。
Subject: Mobile phone problem
Dear Editor,
I am a middle school student. I used to bring a mobile phone with me during school hours. But the teachers think using mobile phone is distraction (分散注意力的事) to students during school hours and also causes so much trouble in class. So now we aren't allowed to bring mobile phones to school.
I find it really inconvenient (不方便的)。 My parents feel unhappy because they can't get in touch with me(不能与我有联系) . But I can't make our school change this rule. What do you think I should do to solve this problem?
Liu Fengyi
Liu fengyi's occupation (职业) | ____ |
Purpose (目的) for writing the e-mail | ____ |
The school rule | Students aren't allowed to ____ |
Thing that Liu Fengyi used to do | She used to ____ |
Reason(原因) why Liu Fengyi's parents are unhappy | They can't ____ |
性质：“①最小正周期为
；②图象关于直线
对称；③在
是（ ）