大多数人想到防毒面具或呼吸器时，脑海中呈现的是一件配有某种过滤罐的、塑料或橡胶材质的密闭面具。
When most people think about gas masks or respirators, what they usually envision is a tight-fitting plastic or rubber face mask with some sort of filter cartridge.
固体渗碳的方法是将要处理的零件与木炭或焦炭这些含碳的材料一起放入密闭容器。
Pack carburizing consists of placing the parts to be treated in a closed container with some carbonaceous material such as charcoal or coke.
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