He has no knowledge about anal sex.

He started training his anal sphincter.

He is majoring in syntax at university.

He is an expert in enzymology and conducts many researches.

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.