把面罩盖在口鼻上，像往常一样呼吸。
用丁基合成橡胶粘合胶将罩盖密封在热交换器上。
Seal cover over the heat exchanger airtight with butyl adhesive.
住房外面有楼梯，公司已经开始用网罩盖住楼梯，以防止工人跳楼。
The living quarters have stairs running up the outside walls and the company has begun covering them with nets to prevent people from jumping.
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