He solved the problem rapidly.

I'm always amazed at the speed of his work.

I appreciate his quick correspondence.

We responded quickly to that problem.

My grandfather participated in the Battle of Iwo Jima.

Iwo Jima was a fierce battleground during the Pacific War.

This hot spring has a high sulfur content.

Can you answer this question?

This area has a strong smell of sulfur.

This factory is emitting a large amount of sulfur dioxide.