1
a PhD in [field]
介词 in 后接学科领域，说明博士学位的专业方向。
A PhD in physics is a challenging but rewarding degree.
物理学博士学位是一个艰难但回报丰厚的学位。
博士学位；哲学博士学位
phds — plural of phd
先理解核心含义，再看它在真实句子里的用法。
博士学位；哲学博士学位
a doctorate; the highest degree awarded for graduate study, usually based on at least three years of study and a dissertation.
A PhD in physics is a challenging but rewarding degree.
物理学博士学位是一个艰难但回报丰厚的学位。
abbr. 哲学博士学位(Doctor of Philosophy)
d a doctorate usually based on at least 3 years graduate study and a dissertation; the highest degree awarded graduate study
She spent five years working on her PhD in chemistry before she felt ready to defend her dissertation.
她花了五年时间攻读化学博士学位，直到觉得自己准备好才进行论文答辩。
After completing his PhD, he took a research position at a university in Japan.
完成博士学位后，他在日本的一所大学获得了研究职位。
Many universities require a PhD for a full professorship in the sciences.
许多大学要求科学领域的正教授拥有博士学位。
介词 in 后接学科领域，说明博士学位的专业方向。
A PhD in physics is a challenging but rewarding degree.
物理学博士学位是一个艰难但回报丰厚的学位。
do a PhD 常见于英式英语，口语中尤其常用，相当于 study for a PhD。
She is doing a PhD in history at Oxford.
她正在牛津大学攻读历史学博士学位。
正式用法，常用被动语态表示由大学或学术机构授予学位。
He was awarded a PhD for his research on vaccines.
他因疫苗研究被授予博士学位。
Not this
She received a PhD of Chemistry.
Use this
She received a PhD in Chemistry.
表示某学科的博士学位时，介词要用 in，不能用 of；of 是直译中文“的”造成的错误。
Not this
He is studying a PhD in economics.
Use this
He is studying for a PhD in economics.
英语中“攻读博士学位”要说 study for a PhD 或 do a PhD，不能说 study a PhD，因为 PhD 是学位而非学习内容。
Not this
She is a PhD in mathematics.
Use this
She has a PhD in mathematics.
中文“她是博士”不能直译为 She is a PhD，因为 PhD 指学位而非人；应说 She has a PhD 或 She is a PhD holder。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
博士生
She is a PhD student at Oxford.
她是牛津大学的博士生。
博士项目
This PhD program takes three to five years.
这个博士项目需要三到五年完成。
博士论文
He is writing his PhD thesis on climate change.
他正在写关于气候变化的博士论文。
获得博士学位
She earned her PhD in chemistry last year.
她去年获得了化学博士学位。
博士候选人
After passing the exams, she became a PhD candidate.
通过考试后，她成为博士候选人。
攻读博士学位
He decided to pursue a PhD in physics.
他决定攻读物理学博士学位。
在……方面有博士学位；对……很有研究（常用来夸张地调侃某人是某方面的“专家”）
He has a PhD in making excuses.
他在找借口方面简直是博士级水平。
做某事不需要多高深的知识；明摆着的事
It doesn't take a PhD to know you should save some money each month.
不用多高深的知识也知道每个月应该存点钱。
PhD 代表“越堆越高，越挖越深”。
A humorous backronym for Doctor of Philosophy, made famous by Jorge Cham's webcomic 'Piled Higher and Deeper' (PhD Comics), which humorously portrays the struggles and absurdity of graduate school.
这是对 Doctor of Philosophy（哲学博士）的幽默拆解，因 Jorge Cham 的网络漫画《Piled Higher and Deeper》（PhD Comics）而广为人知，该漫画幽默地描绘了研究生阶段的挣扎与荒诞。
Use phds naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 PhD 拆成 P（Philosophy 哲学）+ h（high 高）+ D（Doctor 博士），想到“哲学最高博士”，即最高学位。
语域：mixed 常见场景：academic writing、campus conversation、job applications PhD 是 Doctor of Philosophy 的缩写，指哲学博士学位；在学术写作、求职简历等正式场合很常见，日常谈论学历时也会直接说 PhD。正式程度随语境变化，一般无明显口语禁忌。
真正与 phd 末尾 /diː/ 押韵的词：bee /biː/、tea /tiː/、key /kiː/。phone、photo、phase 中的 ph 读 /f/，而 phd 中的 ph 是字母 p 和 h，读 /piː eɪtʃ/，拼写相似但发音不同。
Dictionary facts from ECDICT, WIKTIONARY.