Everyone was paying their respects in silence.

He is suffering from a serious disease.

He was laughing happily.

He looked out the window.

I sincerely apologize.

Chromium has the property of changing color depending on its oxidation state.

He was blocking the road.

Chromium is an important element in the production of steel.

Neodymium is one of the most powerful permanent magnets on Earth.

This system is very efficient.