He was involved in the development of the hydrogen bomb.

Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.

He is not necessarily wrong.

He was so nervous that his hands stiffened.

This material has ferromagnetism.

When the strong shaking occurred, we immediately evacuated.

He is a very patient person.

His accent gives power to his words.

Please close the window because the wind is strong.

He is a person of great luck.