名词
中文翻译：索引环
同义词：
['index', 'indexing ring']
例句：
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1.The index ring on the computer keyboard is used to indicate which keys are being pressed.
电脑键盘上的索引环用来指示哪些键正在被按下。
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2.The index ring was used to mark the beginning of a new chapter in the story.
索引环被用来标记故事中新章节的开始。
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3. The index ring was removed from the book to allow for easier reading.
从书中移除了索引环以便阅读更轻松。