In the Edo period, women blackened their teeth as a symbol of beauty.

It was my first time catching a bighead carp.

I am majoring in physical chemistry at university.

Sufficient caution is necessary when handling radioactive materials.

I am majoring in biophysics at university.

Cosmic background radiation is considered evidence of the Big Bang.

Radioactive elements are produced in nature and scientific experiments.

He attacked the enemy using a flamethrower.

The police found a drowned corpse in the river.

The structure of this building is very sturdy.