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

Because her immune system is weak, she catches a cold easily.

He loves visual kei bands.

We are a part of the Milky Way.

He found her on a dating website.

The Solar System is composed of eight planets, including Earth.

In this experiment, we will use the International System of Units.

He is deeply involved in the study of the meridian system.

We use this coordinate system to locate the position of an object.

In physics, the inertial frame of reference is a very important concept.