The International System of Units is a standard of measurement widely used around the world.

The SI system is a standard unit system used worldwide.

The parasympathetic nervous system helps our body to relax and conserve energy.

The sympathetic nervous system controls the body's stress response.

It's zero degrees outside.

This is an example of our custom.

He bowed and left the room.

Do you know his age?

Rei is truly a lovely woman.

This miracle drug completely cured my illness.