你八成是被那個同事唬了,
這是那個學校的獸醫系博士班課程規劃網頁,
https://vstp.vetmed.ucdavis.edu/curriculum
請注意中間對博士生研究計畫的說明
"The students’ PhD program is guided under the mentorship of thesis advisors, participating graduate program advisors, and the students’ dissertation committees along with mentoring input from the VSTP Director. The average time to PhD is 3.65 years."
每位博士生會被指派論文指導教授(thesis advisors),
絕沒有博士不用寫博士論文(PH.D thesis)的鳥事.