predictor
noun [ C ] uk/prɪˈdɪk.tər/ us/prɪˈdɪk.tɚ/
（可让人预报未来的事件或事实）预报性事物
something such as an event or fact that enables you to say what will happen in the future
One of the best predictors of a student's achievement is the socioeconomic status of the parents. 学生未来成就的最好的预报因素之一是父母的社会经济地位。