老师按能力将历史课分班。
The teacher sectioned the history class by ability ratings.
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学校的孩子们按年级分班。
Children in school are classified into grades.
小孩子是怎么分班分组的？
How does the center group the children? By age?
在60年代初，许多学校部门都觉得按水平分班是一个棘手的问题。
Many school boards found segregation a hot potato in the early 1960s.
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