A grammarian is someone who studies grammar and knows it in a serious way — how a language puts sentences together, what the rules are, and where the rules leak. In a university this can be a real job: describing the system, arguing about a construction, writing a grammar.

A grammarian isGrammarian是 someone who studies grammar and knows it in a serious way很認真研究文法、也很懂文法的人 how a language puts sentences together, what the rules are, and where the rules leak包括一個語言怎麼把句子組起來、規則是什麼、規則又在哪裡會失靈 In a university this can be a real job在大學裡這可以是一份真正的工作 describing the system描述這套系統 arguing about a construction為了某個句構爭論 writing a grammar寫一本文法書

In ordinary talk it can be slightly teasing: a grammarian is the person who cannot hear a sentence without noticing the join. Though actually, knowing grammar well and being unkind about other people’s English are not the same thing; the word itself only names the study, not the personality.

In ordinary talk it can be slightly teasing平常講話裡這個詞可以帶點揶揄 a grammarian isgrammarian指的是 the person who cannot hear a sentence without noticing the join那種聽一句話一定會注意到接縫在哪裡的人 Though actually, knowing grammar well and being unkind about other people's English are not the same thing不過其實，很懂文法跟對別人的英文很刻薄是兩回事 the word itself only names the study, not the personality這個字本身只是在說這門學問，不是在說這種個性

It is a fairly formal, bookish word. You would not call a classmate a grammarian just because they remembered the past tense.

It is a fairly formal, bookish word這是個相當正式、書面的字 You would not call a classmate a grammarian你不會就叫一個同學grammarian just because they remembered the past tense只因為他記得過去式