His father fell into a persistent vegetative state due to a traffic accident.

Basic oxides react with acids to produce salt and water.

This area is affected by radioactive fallout from past nuclear tests.

It is important for us to respect cultural diversity and understand each other's differences.

The study of filterable pathogens is an important part of virology.

She was diagnosed with polycystic ovary syndrome.

He has full mastery of the art of cooking.

Manjiko is my best friend.

Mitsuyoshi is my best friend.

Kunimitsu is my best friend.