This plant reproduces using spores.

May I inquire about your health, teacher?

I would like to inquire about the teacher's health.

Every weekend, I do volunteer work at a local shelter.

I am very interested in social science.

The radiation dose in this area exceeds the safety standards.

He measured the amount of radiation using a radiation dosimeter.

Ejective, or 'houshutsuon' in Japanese, is one of the phonetic features used in certain languages.

This area is seriously contaminated with radioactive isotopes.

This rock is radioactive, so care must be taken when handling it.