关于疾病如何传播，人们普遍缺乏了解。

There is widespread ___ignorance about how disease spreads.

我对她完全不了解世界历史感到震惊。

I was shocked by her total ___ignorance of world history.

对现代技术的起源一无所知是对发明者的不尊重。

Living in ___ignorance about the origins of modern technology is a disservice to those who invented it.