He continued his work overnight.

He is always working at night.

During the polar night, the sun does not rise even once.

I made new friends in the Seiya chat room.

I heard that she works in the nightlife industry.

Mariko is my best friend.

He is a master of versatility, capable of handling anything.

He is fulfilling his responsibility as a president who controls state affairs.

This company is aiming for diversification of products.

He holds the sovereignty of that country.