每当谈到电脑技术时，他就装成一个什么都不知道的人。

He pretends to be a ___know-nothing whenever computer technology is discussed.

别听他的建议，他对投资完全是个外行。

Don't take his advice, he's a total ___know-nothing about investing.

19世纪中叶，一无所知党在美国曾短暂兴起，反对天主教移民。

In the mid-19th century, the ___Know-Nothing Party briefly rose in the US, opposing Catholic immigrants.