He likes to take a walk in the park at dusk.

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.

The philosophy of Mohism, one of the thoughts of ancient China, advocated universal love and fairness.

He fulfilled his responsibilities as a government official.

We must absolutely obey the orders of the emperor.

He was promoted to a high-ranking position.

In mahjong, the opponent on my right, the lower house, is a formidable enemy.

It's my dream to visit the beautiful traditional Japanese townhouses in Kyoto.