翻译一段英文"Another important error is mixed-ability teaching, or
翻译一段英文
"Another important error is mixed-ability teaching, or teaching in ability groups so separate that the most able groups are held back and are bored while the least able are lost and hardly bored."
这段英文谁能帮我通顺的翻译一下.
不要拿有道英译汉糊弄提问题的人,这不尊重