限制学生使用手机在一些国家已经是很普遍的做法。
It's already common practice in some countries to limit students' use of mobile phones.
限制中小学生使用手机已经是全世界的普遍做法。
It's already common practice worldwide to limit students' use of mobile phones in primary and secondary schools.
在此部分中，我将介绍我认为最可能遇到的最普遍的限制类型。
In this section, I present what I consider the most common types of limitations we are likely to encounter.
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