名词
中文翻译：索引标记
同义词：
['reference point', 'reference number例句：1. The index mark on the map indicates the location of the city center.（地图上的索引标记指示了市中心的位置。）2. The index mark is used to indicate the beginning of a new paragraph in a book.（索引标记用于指示书籍中新段落的开始。）3. In order to find the correct page', 'I need to follow the index mark on the spine of the book.（为了找到正确的页面，我需要跟随书脊上的索引标记。）']
例句：
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1. The index mark on the map indicates the location of the city center.
地图上的索引标记指示了市中心的位置。
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2. The index mark is used to indicate the beginning of a new paragraph in a book.
索引标记用于指示书籍中新段落的开始。
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3. In order to find the correct page, I need to follow the index mark on the spine of the book.
为了找到正确的页面，我需要跟随书脊上的索引标记。