You can use spectroscopy to examine the components of a substance.

This scent comes from benzoin.

The population density of this area is very high.

I like reading uncle's composition.

My college is in Tokyo.

I want to go to the Principality of Andorra.

My great-great-grandmother is still healthy and living a long life.

It's convenient to live in a city where transportation facilities are well-developed.

In chemistry class, I learned about alkanes.

Alkynes play a very important role in organic chemistry.