Alkynes play a very important role in organic chemistry.

Alkenes, also known as olefin hydrocarbons, play an important role in organic chemistry.

Alkenes play a very important role in organic chemistry.

I have started learning Traditional Chinese.

I am learning Simplified Chinese.

He said, 'Misery of life starts at literacy,' and spoke about the hardships of learning.

He picked up the whip and started practicing.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

I studied linear algebra at university.

Mr. Koza puts pepper on everything.