灰色的 粉尘积了厚厚几英尺，在落地前就像纽约的雪，低沉又空旷的声音在建筑里回响，在烟雾中消散。
Sounds were both muffled and magnified, echoing off buildings, softened by the smoke.
在建筑应用中还需同时兼顾造价、美观、防火、防潮、粉尘、耐老化等多方面问题。
In architectural applications still need both the cost, beautiful, fire prevention, moistureproof, dust, aspects of aging.
其主要污染源为工业粉尘、烟尘，机动车排放的尾气，建筑施工及道路交通产生的尘污染。
Its main pollution sources were industrial dust, smoke dust, exhaust emission and construction and traffic dust.
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