It is really worth researching that the difference between the meaning and usage about synonym, especially the research on the character in writing and practical language.

• 日语提示助词中的类义词在词义和用法上的区别,特别是日语提示助词在篇章中和实际语言运用中的特点的研究,目前在语法学界也属前沿领域,是一个很值得研究的课题。