tā / dà xué / èr nián jí / shí / cóng / wù lǐ / gǎi xué / jì suàn jī / xiàn zài / yǐ jīng / chéng le / chéng xù yuán

他大学二年级时从物理改学计算机，现在已经成了程序员。

In his sophomore year, he switched from physics to computer science, and now he is a programmer.