4 sentences

1. 他在大学里主修生物学。

   tā zài dà​xué lǐ zhǔ​xiū shēng​wù​xué.

   He majored in biology in university.

   Source: Dong Chinese Dictionary

2. 这个理论借用了生物学中的进化概念。

   zhè​ge lǐ​lùn jiè​yòng le shēng​wù​xué zhōng de jìn​huà gài​niàn.

   This theory borrows the concept of evolution from biology.

   Source: Dong Chinese Dictionary

3. 学生们需要记住不同动物在生物学上所属的纲。

   xué​sheng men xū​yào jì​zhu bù​tóng dòng​wù zài shēng​wù​xué shàng suǒ​shǔ de gāng.

   Students need to memorize the biological classes to which different animals belong.

   Source: Dong Chinese Dictionary

4. 达尔文的进化论是生物学中最著名的学说之一。

   Dá'ěr​wén de jìn​huà​lùn shì shēng​wù​xué zhōng zuì zhù​míng de xué​shuō zhī​yī.

   Darwin's theory of evolution is one of the most famous theories in biology.

   Source: Dong Chinese Dictionary