首都中心以及周边城镇的建筑都由一些劣质的混凝土与沙混合组成，缺乏用来加固建筑以防地震的钢筋。
In the centre of the capital and the neighbouring towns the buildings are too often made of weak concrete, cut with sand and lacking the steel rods that would fortify them against shocks.
研究了以唐山市西窑热电厂劣质粉煤灰为原料生产加气混凝土的新工艺。
Research has been done on a new technology in producing aerated concrete with inferior pulverized-coal ash produced by Tangshan Xiyao Power Plant.
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