By the time I got to college I was double majoring, going to summer school and devoting myself to every kind of extracurricular activity I could find.

打从我来到大学我加倍努力并上暑期班学习，致力于我能找到的各种课外活动。

youdao

After school Nick went on with further study and obtained a double bachelor degree majoring in accounting and financial planning.

中学毕业之后，尼克继续深造，并最终获得了会计及财务规划双学士学位。

youdao

I'm double majoring. I'm doing Sociology and Media Studies,

我有双学位，我学的是社会学和传媒学，

为什么来伯克利？ - SpeakingMax英语口语达人

or they're double majoring

或者是双学位

五年级 - SpeakingMax英语口语达人

At age 20, while double-majoring in English and computer science at East Carolina University, he learned that his swollen lymph nodes were a symptom of stage 2 Hodgkin's lymphoma.

CNN: His other car is on Mars