名词
中文翻译：索引
同义词：
['reference', 'key', 'pointer例句：1. The index finger is the first one you can use to point.（食指是你可以首先用来指东西的手指。）']
例句：
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1. The index finger is the first one you can use to point.
食指是你可以首先用来指东西的手指。
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2.The index of a book is the page number at the beginning of each chapter.
一本书的索引是每一章开头的页码。
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3.The stock market index has been on the rise recently.
最近，股市指数一直在上升。