If you deduce something or deduce that something is true, you reach that conclusion because of other things that you know to be true.
双语例句
例： Alison cleverly deduced that I was the author of the letter.
艾莉森聪明地推断出这封信是我写的。
例： The date of the document can be deduced from references to the Civil War.
该文件的日期可以从其对内战的提及处推算出来。
例： The researchers have to analyse a huge amount of information in order to deduce any conclusions.
研究人员要推断出任何一种结论都得分析大量信息。