Doctoral describes work done as part of the university degree of doctor — the highest research degree, usually a PhD. A doctoral thesis (or doctoral dissertation) is the long piece of writing. A doctoral student is someone doing that degree. A doctoral programme is the course of study.

Doctoral describes work done as part of the university degree of doctordoctoral用來形容跟doctor（博士）這個大學學位有關的事物——the highest research degree, usually a PhD也就是最高的研究學位，通常是PhD。A doctoral thesis (or doctoral dissertation) is the long piece of writinga doctoral thesis（或doctoral dissertation）指的就是那篇長篇論文。A doctoral student is someone doing that degreea doctoral student指的是正在讀這個學位的人。A doctoral programme is the course of studya doctoral programme指的是這個學位的課程。

It does not mean “of a medical doctor,” even though we also call a physician Doctor. You can say medical school, but the usual pair is doctoral for the research degree: doctoral research, a doctoral committee.

It does not mean "of a medical doctor,"它不是指『醫生的』，even though we also call a physician Doctor雖然我們也把醫師稱為Doctor。You can say medical school你可以說medical school（醫學院），but the usual pair is doctoral for the research degree但跟研究學位搭配的通常字眼是doctoral：doctoral research, a doctoral committee像doctoral research（博士研究）、a doctoral committee（博士學位口委會）。

It is an adjective; the name of the degree itself is a doctorate. In everyday talk people often just say PhD.

It is an adjective它是一個形容詞；the name of the degree itself is a doctorate學位本身的名稱叫做a doctorate。In everyday talk people often just say PhD日常口語裡人們通常就直接說PhD。