the school started pre-primary classes
...red both Chinese and English streams classes开办英文与华文并重的双语班 The school started pre-primary classes开办启蒙班 The pre-primary classes in 1979.1979年学前班 ..
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the school started pre-primary classes
学校开始了学前教育
以上为机器翻译结果，长、整句建议使用 人工翻译 。