My mother tongue is Japanese.

If you spend a long time in a room where cotton dust is floating, you may cough.

They (referring to women or girls) are my best friends.

Kubota is my best friend.

My grandparents are healthy and living a long life.

I bought a new bodysuit.

It is said that this medicine has a placebo effect.

Her family adopts a matriarchy.

He has a collection of bottle ships.

Riboflavin is a type of vitamin B2, which is a nutrient necessary for health.