Although helium is nontoxic and inert, it can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support life. 尽管氦无毒且不活泼,通过取代空气中的氧,使之下降到维持生命所必须的水平以下,它可以成为简单的窒息物。
Although nitrogen is nontoxic and largely inert, it can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support life. 尽管氮无毒且很大程度上不活泼,通过取代空气中的氧,使之下降到维持生命所必须的水平以下它可以为简单的窒息物。
Acetylene is a simple asphyxiant and anesthetic. Experiments have shown there to be no harmful effects from chronic exposure to acetylene at high concentrations. 乙炔是简单的窒息物和麻醉剂。实验显示慢性接触高浓度乙炔没有有害影响。