This eigenfunction is one of the fundamental concepts of quantum mechanics.

The Burgundian Netherlands was a historically important region.

An intercontinental ballistic missile is a weapon with a very large destructive power.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

Simple Mail Transfer Protocol is a protocol for sending and receiving emails on the Internet.

Himemiko is my best friend.

This book has up to three volumes.

He looked like a god.

Mr. Kayamoto went to the festival.

He said, 'Misery of life starts at literacy,' and spoke about the hardships of learning.