在理论上的认识分歧较大，在实践中的困惑难点较多，对此进行探讨和研究很有必要性。
As there is great divarication in theory, confusing and difficult in practice, it is necessary to argue and study this issue.
研究性学习具有开放性、探究性和实践性的特点，在实施的过程中也存在许多困惑和难点，例如，如何获得研究资源、课程的管理及评价等。
In the process of practice inquiry learning, there are also many puzzles and difficulties, such as how to gain research resource, the management and evaluation of the course etc.
现在完成时态是中学英语语法中的重点和难点，经常给师生带来困惑。
As one of the most important and confusing grammatical tenses in high-school English, present perfect tense brings about much perplexity to both teachers and students.
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