He has been living in this town for several decades.

He drew a decagon shape.

His company made a profit of one billion yen.

My pet Bengalese finch is very cute.

We have been working on this project for ten months.

He solved the problem in a scientific way.

This reaction occurs through a chemical process.

He is good at tactical thinking.

He exercises every day and leads a healthy life.

Fundamental knowledge of mathematics is necessary to solve advanced problems.