Understanding dynamical systems is an important part of physics.

The Japanese imperial family line is said to have the longest history in the world.

She often reads books on spirituality.

She is deeply devoted to the New Age spirituality.

He loves 'Narou-kei' novels and reads them every day.

He likes to take a walk in the park at dusk.

The International System of Units is the standard measurement system used by scientists all over the world.

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

The central nervous system is responsible for transmitting information and controlling the body.

Moderate exercise and a balanced diet are important for maintaining the health of the respiratory system.