pedant

他总爱纠正别人的小错误，真是个学究。

He's such a ___pedant that he corrects everyone's minor mistakes.

晚宴上那个学究不停地打断别人，解释每个人句子中的准确语法。

The ___pedant at the dinner party kept interrupting to explain the exact grammar of everyone's sentences.

真正的学究无法安静地看完一部历史剧，总是指出服装和道具中每一个失实之处。

A true ___pedant cannot watch a historical drama without pointing out every inaccuracy in the costumes and props.