If you deduce something or deduce that something is true, you reach that conclusion because of other things that you know to be true.
例句
Alison had cleverly deduced that I was the author of the letter.艾莉森已经聪明地推断出那封信就是我写的。The date of the document can be deduced from references to the Civil War...这份文件的日期可以从其中多次提到内战之处进行推断。
英汉词典释义
vt.
推论, 演绎，推断
On the basis of evidence we deduced that he was guilty.根据这些证据我们推断他是有罪的。Because there was no cloud, he deduced that it was going to be a cold night.由于天上无云, 他推断夜晚会很寒冷。The police were able to deduce where the fugitive was hiding.警方成功地推断出那逃亡者躲藏的地方。