求翻译：一直以来情态是哲学家，逻辑学家和语言学家研究的热门话题，尤其是语言学家对情态做了较为深入全面的研究，取得了丰硕的成果；但尽管如此，情态的模糊性仍然是语言学习的难点，仍然困惑着语言学习者。情态的表现手段很多，出于对形式，句法等特征共性方面的考虑，本文把研究对象集中在核心情态动词上。是什么意思？

Modality has been a hot topic for philosophers, logicians and linguists, especially linguists have done a more in-depth and comprehensive study of modality, and achieved fruitful results; Nevertheless, modal fuzzy still language learning difficulties, is still confused with language learners. Modal

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The spirit has since always been the philosopher, the hot topic of discussion which the logician and the linguist studies, the linguist has in particular done more thorough comprehensive research to the spirit, has yielded the substantial result; But for all this, the spirit fuzziness still was the

Modal is a philosopher has always been, and hot topics in the study of logic and Linguistics, especially linguists to do a more in-depth and comprehensive study of modality, has achieved great results, but nevertheless, modal ambiguity is still the language of learning difficulties, still confused w

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