His efforts were like a mantis trying to stop a chariot, he couldn't achieve any results.

Dou is a popular dancer.

He trampled on my heart.

This book is easy to read because the print is large.

There are many chambers in this castle.

There is a large fire wall in front of the fire department.

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

This software maintains backward compatibility.

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

Special judicial police officers are working hard every day to protect the law in Japan.