the number of people in playground are about 30.some of them are my classmates,some others are the next class.the rest are not my school
可以翻译成：There are total 30 people in the playground, some are my classmates and the other is next to the class, the rest is not belong to my school .
the other 是表示其他一部分，others则表示所有剩余的一部分。belong to 是属于的意思。
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