墙上的痕迹表明木屋顶被用来支承建坟墓，木材早已被金字塔重量作用下倒塌。
Marks in the wall indicate wooden roof supports were used to create the tomb, but the wood long ago collapsed under the weight of the pyramid built above.
绷绳稳定塔可以漂浮并浮动，这意味着在建造过程中需要较少的钢材，因为它不需要支承其自身的重量。
The guyed tower is buoyant and floats, which means that less steel is needed in its construction because it does not have to support its own weight.
介绍了填料洗涤塔的塔体、填料、填料支承装置和液体分布装置的结构和设计。
Structure and design of tower body, packing, packing support and liquid distributor for a new type of packed tower are described.
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