After waiting for forty minutes, I heard some noise in the outer room.
等了40分钟后，我听到了外边房间的什么声音。
How come I'm the noise checker-outer?
我怎么就变成了个噪音检查员了？
Building outer wall high temperature fire protection, sound-insulated noise reduction.
建筑物外墙高温防火、隔音降噪。
Building outer wall high temperature fire protection, sound-insulated noise reduction.
建筑物外墙高温防火、隔音降噪。
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