Cement screed is used for the floor (for sound insulation and thermal mass) while the ceiling consists of perforated cement-based panels to absorb sound.

水泥砂浆层用于地板(达到隔音隔热的目的)，而天花板由多孔的水泥基板吸收声音。

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Before painting, interior cement wall and ceiling surfaces must be firm, flat, dry, clean and no dust, should be noted.

涂装前，室内水泥墙面及天花板表面必须稳固、平整、干燥、清洁和无浮尘，应注意。

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Dozens of heavy cement panels fell off the tunnel's ceiling onto the roadway below today, trapping motorists.

今天，数十块由混凝土制成的隧道天花板掉落到路面，并砸中车辆。

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Last spring, I posted a column on this blog arguing that, in the pharmaceutical business, the glass ceiling looks a bit like cement.

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