Explorers even need to wear special masks to protect themselves from the gases in these caves.

探险家们甚至需要戴上特殊的面具来保护自己不受洞穴里气体的伤害。

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According gto tradition, people would dress up in costumes (wear special clothing, masks or disguises) to frighten the spirits away.

按照传统习俗，人们会盛装(穿戴一些特殊的服饰，面具或者装饰)来吓跑鬼魂。

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He is restricted to a special "negative pressure" room that traps and cleanses air particles, and medical staff will wear masks when in contact with him.

BBC: Andrew Speaker conducted the interview wearing a mask