氮仅仅是窒息剂，认为是无毒的。
窒息剂，窒息原因导致窒息的物质，如有毒气体，或一事件，如溺水。
A substance, such as a toxic gas, or an event, such as drowning, that induces asphyxia.
单纯窒息剂----该产品不含氧，因此如果在相对封闭的空间中发生泄漏可能引起窒息。
Simple Asphyxiant - This product does not contain oxygen and may cause asphyxia if released in a confined area.
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