Nerdsplaining means explaining in an overly intellectual, obsessively¹ detailed² way, particularly when the topic is obscure or highly technical.

 

“书呆子解释”即用过分智力的、详尽的方式解释某事，特别是当主题比较晦涩或科技含量很高时。

 

Example：

I really just spend over an hour nerdsplaining to Meg about different kinds of radiotoxicity.

我真的花了一个多小时跟梅格“书呆子解释”放射毒性的不同种类。