know-alls

英

美 [noʊ ɔlz]

n.  自以为无所不知的人; 百事通
know-all的复数

柯林斯词典

• 自以为无所不知的人；百事通
  If you say that someone is aknow-all, you are critical of them because they think that they know a lot more than other people.

in AM, use 美国英语用 know-it-all

双语例句

• Moral relativism, cloaked in jargon, was on the march, promoted by the tedious, despicable know-alls of the supposedly educated classes.
  道德相对主义，披着各种名义的外衣，踏步前行，经由所谓的知识阶级之中乏味卑劣且自称无所不知的人一路炒作。