I bought a new sofa.

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

Alkynes play a very important role in organic chemistry.

In chemistry class, I learned about alkanes.

Alkenes play a very important role in organic chemistry.

He said, 'It's difficult to make a life,' explaining the phrase 'When a man steps over the threshold, he has seven enemies.'

The rainbow lorikeet is known for its vibrant colors.

He used a handkerchief to wipe his sweat.

He has a character that perfectly fits that job.

Syoku is a kind person.