摩天大楼的地板和天花板是分段建造的，每一段有15层。
The floors and ceilings of the skyscrapers are built in sections, each measuring 15.
巨石阵位于伦敦西南约140公里索尔斯堡垒平原，在公元前3000年和公元前1600年分三阶段建造而成。
Stonehenge, on the Salisbury Plain about 140 km (90 mi) southwest of London, was built over three phases between 3000 B. C. and 1600 B.
尽管它的历史可以追溯到金字塔建造后的几百年，但它的复杂程度表明，埃及人可能很长一段时间以来一直在思考飞行的想法。
Although it dates from several hundred years after the building of the pyramids, its sophistication suggests that the Egyptians might have been developing ideas of flight for a long time.
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