Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.

The United Nations Environment Programme is providing solutions to global environmental problems.

Have you finished this year's big cleaning yet?

I was cleaning all day today.

We are an extended family, and more than 10 of us live together.

My older brother is attending the University of Tokyo.

He was taken to the hospital due to major hemorrhaging.

My great-grandfather used to do farming in the past.

In philosophy, we consider ourselves a part of the macrocosm.