However, modal verb remains to be a problematic area in English grammar due to the discrepancies lying in the description of its meanings and even its grammatical categories.
然而， 情态动词一直是英语语法中的一个难点，各语法流派在对其意义和语法范畴的描述中存在分歧。
Focusing on this problem, a modal parameters identification algorithm based on left matrix fraction description of FRF was proposed.
针对该问题，提出一种基于频响函数左矩阵分式模型的模态参数识别方法。
This thesis is about the description analysis and observation of Hongtong dialect on the basis of modal particles synchronically and diachronically.
本文在界定了语气词的基础上从共时角度和历时角度对洪洞方言语气词进行描写、分析和考察。
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