Yozo is always a bright and energetic person.

He donated books to the local library.

He donates books to the local school every year.

The government is planning a tax increase for the next fiscal year.

He solved a large number of problems.

I can't solve this problem because there are too many numbers.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

The Ebola virus is a very infectious virus.

The poliovirus is a virus that primarily enters the body through the mouth and destroys the nervous system.