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

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

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

When you cross the International Date Line, the date changes by one day.

He solved the problem in a scientific way.

This reaction occurs through a chemical process.

He exercises every day and leads a healthy life.

Fundamental knowledge of mathematics is necessary to solve advanced problems.

He is good at tactical thinking.

This park was completely artificially made.