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primary grades 小學低年級。

primary group

Since research shows that children in the primary grades and minority and low - income children benefit most from smaller classes , it makes sense to direct resources particularly toward these children 由于有研究表明,低年級學生、少數民族學生、來自低收入的家庭的學生從小班中受益最大,因此應優先選擇這些學生。