He refused to clean up the vomit.

This mineral is very rare.

My favorite bowl dish is Oyakodon.

Mr. Koshu is my best friend.

He has a habit of drinking a small amount of alcohol every night.

Mr. Koshu is my best friend.

The small fish are swimming in the river.

The small fish are swimming in the river.

This infinitesimal change is a fundamental concept of differentiation.

The tundra swan lives in cold regions.