He is an expert in enzymology and conducts many researches.

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

The population density of this area is very high.

This scent comes from benzoin.

My college is in Tokyo.

He is an expert in fiber optics.

I can't find my skeleton key.

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

I want to go to the Principality of Andorra.

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