sentence: Nerve agents are poisons that can kill by damaging the nervous system.
sentences_before: In wars, some countries use poison gases against their enemies. Poison gases such as chlorine gas and mustard gas were used in World War I. Corrosive poison gases cause serious burns to the skin, eyes, and lungs.
concept_name: nerve agent
headings: Poison Poison gas
categories: Basic English 850 words Health