讲一讲Stonehenge A prehistoric monument helping us to uncover the secrets of the past.In the Wiltshire countryside of England stands o n e of the most iconic a n d oldest human-made l a n d m a r k s i n t h e w o r l d Built over thousands of years, Stonehenge is the only surviving stone circle of its kind and has become a site of incredible archaeological importance. Although it h a s revealed a lot about certain practices of the past, the structure is still shrouded i n mystery, mainly because we still can't b e s u r e what it was built for. The most popular theory is that it was a prehistoric temple, a s the stones are precisely aligned with the movements of the S u n across the sky, which has special religious significance. What w e d o know i s that its construction began in 3100 BCE, when a large circular ditch was dug using tools m a d e from antlers. Around this time, the site was used for burials; in fact it's the largest late Neolithic cemetery in t h e UK. In 2500 BCE, the stones were erected, having been worked into shape and smoothed using sarsen a n d flint hammerstones, a n d a f e w hundred years later were rearranged into their final position. Over the years many of the stones have toppled or been removed, leaving Stonehenge in its current state.Superhenge In 2015, scientists f o u n d w h a t t h e y t h o u g h t w a s another s t o n e monument, fi v e t i m e s t h e size of Stonehenge, buried less than three k i l o m e t r e s a w a y f r o m t h e i c o n i c landmark. Dubbed a 'superhenge', it was detected using ground-penetrating r a d a r a n d believed t o feature more than 100 stone monoliths. However, when a dig was conducted, a r c h a e o l o g i s t s i n s t e a d f o u n d a s e r i e s o f d e e p pits that once held large wooden poles. The site was originally home t o the people who built Stonehenge a n d t h e poles w e r e e r e c t e d when they left, perhaps a s a memorial. However, they were later removed, and the pits were filled with chalk and covered over with a d i r t bank. c o m p l e t e d Discover how Stonehenge might have l o o k e d i n 2 2 0 0 B C E.Assembling Stonehenge . How might t h e structure have been p u t in place with primitive tools?Tr a n s p o r t a t i o n The stones were dragged to the site on rollers a n d sledges, a n d s o m e e v e n c a m e on r a f t s d o w n t h e River Avon. Positioning The stones were placed in large holes with.sloping sides and lined with wooden stakes a t t h e back.R a i s i n g t h e s t o n e s Ropes, a wooden A-frame and sheer manpower were used t o pull the stones upright, then the hole was packed with rubble. Placing the lintels Timber platforms were used to lift the horizontal lintels into position before they were placed on top of the upright stones.生成一个英文讲解视频

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