在能源价格低廉的年代，房屋建筑商并不太担心未密封的裂缝。
Back in the days when energy was cheap, home builders didn't worry much about unsealed cracks.
古代的建筑者是如何建造这些庞然大物的，这一直是个未解之谜，但很明显它需要付出大量的脑力和体力。
How ancient builders managed to build these massive structures has never been fully answered but the effort clearly required brains and brawn4.
房屋、建筑物以外未投入使用的固定资产；
The fixed assets which have not yet been put into use, among which houses and buildings are not included;
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