paragraph marks

例句：

1. 1. The teacher marked the paragraphs with different colors for emphasis.
   老师用不同颜色标出段落以强调重点。
2. 2.The student wrote a long essay that spanned several paragraphs.
   学生写了一篇很长的作文，跨越了几个段落。
3. 3. The book was divided into several sections with paragraph marks to indicate each chapter.
   这本书被分成几个部分，每个部分都用段落标记来标示章节。