In linear algebra, the upper triangular matrix plays a very important role.

My room is on the upper level.

The grammar of 'Jou-nidan' is an important part in learning Japanese.

This handover is our new project.

They launched a surface-to-air missile.

My hometown is a prefecture-level city.

It is said that a ghost is living in this old house.

Our company's headquarters is in Tokyo.

Colonization is the process by which some countries dominate other countries or regions and impose their own culture and values.

Colonialism continued for a long time until many countries achieved independence.