index

Compared meaning: a sign or number showing a level (noun).

比较义项：表示某事物状态或水平的标志或数值（名词）。

• indicator

  Indicator is the broader, everyday word for any sign, symptom or measurement that reveals a state or level; it need not be numeric and fits informal, qualitative contexts like health, mood or behavior.

  indicator是更宽泛、更日常的说法，指任何能揭示某种状态或水平的迹象、症状或衡量方式；它不一定是数字，适用于健康、情绪或行为等较为非正式、偏定性的语境。

  Body language can be a strong indicator of how someone truly feels.

  肢体语言可以是一个人真实感受的有力标志。

• index 本词

  Index names a specific number, often standardized or composite, used to track a level or rate over time; it is the standard term in economics, statistics and science, and typically rises or falls as a value.

  index指一个特定的数字，往往是经过标准化或综合计算得出的，用来追踪某一水平或比率随时间的变化；它是经济学、统计学和科学领域的标准用词，通常表现为数值的上升或下降。

  The stock market index dropped sharply after news of rising interest rates.

  利率上升的消息传出后，股市指数急剧下跌。

Both words can mean something that shows a level or state. Indicator is broader: any sign or measurement, not necessarily numeric. Index is narrower: a specific, calculated number or ratio, common in economics. Neither index's 'book index' sense nor indicator's 'turn signal' sense is compared.

这两个词在该义项上都可以表示某事物所处的状态或水平，但indicator泛指任何迹象或衡量方式，不一定是数字；index特指经过计算、常用于统计或经济领域的数字或比率。这里不比较index作“（书的）索引”或“食指”的用法，也不比较indicator作“（汽车）转向灯”等具体装置的用法。