Gachikoi is my hometown.

This guy is my old friend.

Due to the fire, black smoke was rising into the sky.

Market research is necessary before conducting a preliminary trial of the new product.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

The history of the Empire of Japan is very interesting.

He said he couldn't agree with the views of the revisionists.

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

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

My room is on the upper level.