求翻译：标志词的有无可以看做是区分被动句类型的重要依据，据此可以将被动句划分为两种类型，一种是有标志被动句，另外一种是无标志被动句，但是大多数的研究都是从从句法层面对被动句的的本身特征以及用法上展开，从篇章角度对被动句进行定量分析研究的文章较少，本文一方面对于有标志被动句标志词的演变做一定探讨，另一方面是选取部分当代小说作为语料基础，对典型标志词在其中的使用规律予以相关探究。是什么意思？

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