但是关于有效教学的理论与实践研究仍存在一定的局限性，这就要求我们不断变换思路从多层面、多角度去研究有效教学，以促进其研究有更大的突破与进展。
It requires that we should constantly change our thinking to make the multi-faced, multi-perspective study of effective teaching, in order to have a greater breakthrough and improvement.
尽管本文对英汉动物隐喻的对比研究存在一定局限性，但是该研究仍具有一定的理论意义和现实意义。
Although there are some limitations in this analysis of animal metaphors, the contrastive study from a cognitive and cultural aspect still has its theoretical and practical significance.
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