名词
中文翻译：索引
同义词：
['key', 'reference', 'marker']
例句：
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1. The index of the book is on the back cover.
这本书的索引在背面。
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2. The index of the dictionary is alphabetically arranged.
字典的索引按字母顺序排列。
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3. The index card was used to quickly locate information in a large collection.
索引卡用于快速查找大量资料中的信息。