为了省去携带现金的麻烦，如今使用手机支付更为普遍。
It is more common nowadays to make mobile payment for the convenience of not carrying cash.
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.
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.
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