名词
中文翻译：指数标记
同义词：
['index', 'indicator', 'mark', 'symbol']
例句：
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1. The index of the stock market has fallen significantly recently.
最近股市的指数显著下跌。
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2. He marked his territory with a flag.
他用旗帜标出了他的领地。
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3. The teacher marked the exam papers as they were completed.
老师在试卷完成后标记了它们。