He is a herbivore man, not interested in marriage or dating.

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

The ecosystem of this lake is very fragile.

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

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

This system is very complex.

He found her on a dating website.

We are a part of the Milky Way.

He was consumed by lust.

He has few friends because he is always intensely greedy.