无论他们的智力是高或低，他们都极端难于教育。
Whether their intelligence is high or low, they are extremely difficult to educate.
中学语文教育难于获得大面积丰收，教学质量没有大幅度提高，重要原因之一是中学生的语文厌学心理作祟。
One of the important reasons why secondary school Chinese teaching is not so fruitful is that students are tired of Chinese learning.
本文简要地分析了环境教育难于深入开展的原因。
This article briefly analyses the reasons why the ee is so difficult to be deepened.
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