Do you know the differences between the new buildings and the old ones? Old buildings have brick(砖)and stone walls.The walls hold up the building. In cities,many modern buildings look as if they are made just of windows.Walls of dark glass reach high into the air.Many buildings are more than 50 stories(层) tall. Are walls of glass strong enough to hold up the new buildings?No. The new glass walls do not hold up the bulidings, but they only cover up the frame(框架) made of steel.Have you ever watched a new building going up? The steel frame is built first. Then the glass walls are hung on the frame.When the building is finished, the frame does not show.The outside looks like windows without walls. The glass walls shine in the sun with no decoration(装饰).Many people find them beautiful just as they are. 最后一个空有点拿不准,
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