Mr. Kyoujin is my best friend.

He rang the hand bell in a Buddhist ceremony.

This butterfly valve is used to control the flow of fluid.

Diseases of the mitral valve greatly affect the function of the heart.

This check valve has the role of preventing water from flowing backwards.

He accurately measured the lumber using a carpenter's square.

You should always have respect for others without forgetting manners.

I think his behavior is a good example.

He explained the importance of respecting propriety using the old form of Japanese, 禮.

Eichi is my best friend.