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.

Scientists are developing a new type of fusion reactor.

He is interested in learning the international auxiliary language.

She uses a diaeresis in her name.

When I see the statues of the Five Wisdom Kings, I feel calm.

He is majoring in philosophy at university, but he is a typical example of a 'learned fool'.

If the motor nerves are damaged, you will lose control of your muscle movements.