2 sentences for 理学 (lǐ​xué)

1. 他在大学主修的是理学。

   tā zài dà​xué zhǔ​xiū de shì lǐ​xué.

   He majored in science at university.

   Source: Dong Chinese Dictionary

2. 他在大学毕业时获得了理学学士学位。

   tā zài dà​xué bì​yè shí huò​dé le lǐ​xué xué​shì xué​wèi.

   He received a Bachelor of Science degree when he graduated from university.

   Source: Dong Chinese Dictionary