I have been to Zhangjiakou.

He is studying the traditional Baijiaxing (Hundred Family Surnames) of China.

He is participating in international negotiations as a member of the School of Diplomacy.

My favorite starter Pokémon are Bulbasaur, Charmander, and Squirtle.

Kazue is my best friend.

He is secretly active as a hentai manga artist.

The steepest descent method is one way to solve optimization problems.

Based on the Air Pollution Control Law, factories must strengthen the management of exhaust gases.

The Riemann sum is a method for approximately calculating the integral of a function.

I plan to go to the People's Republic of China next year.