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Deep in the Central American jungle, the trees are hiding treasures waiting to be discovered.
在中美洲丛林深处，树木将等待被发掘的宝藏隐藏了起来。
A technology called lidar, fires laser pulses from a plane and maps the structures hidden beneath the leaves.
一种叫做激光雷达的技术，从飞机上发射激光脉冲，绘制出了隐藏在树叶下面的结构。
This is in Guatemala, but archaeologists have now discovered another huge city, this time in Mexico, and they're calling it Valeriana.
这是在危地马拉，但考古学家现在发现了另一个大城市，这次是在墨西哥，他们称之为瓦莱里亚纳。
Here's BBC reporter Georgina Rannard.
下面是BBC记者乔治娜·兰纳德的报道。
Now, we don't have any pictures of Valeriana, that's because no one's been there for hundreds of years.
现在，我们没有任何关于瓦莱里亚纳的照片，原因是几百年来没有人去过那里。
So we thought we'd show you what it might have looked like here in this virtual studio.
所以我们想在这个虚拟工作室里向你展示它的样子。
This is a Mayan pyramid temple, similar to the ones that would have been found in the city.
这是一座玛雅金字塔神庙，与在该城市中发现的神庙相似。
In total, the team found almost 7,000 buildings in an area of the jungle about the size of Edinburgh.
总的来说，研究小组在一片与爱丁堡大小相当的丛林中发现了近7000座建筑。
The ancient city is from the Maya civilization, which existed from around 250 AD to 900 AD.
这座古城起源于玛雅文明（约公元250年至900年左右）。
The Maya people were known for amazing buildings, art, legends and writing.
玛雅人以令人惊叹的建筑、艺术、传说和著作而闻名。
They think up to 50,000 people may have lived in this area at its peak in the 9th century, that's more than the number of people who live in the region today.
研究小组认为，在其鼎盛时期（公元9世纪），可能有多达5万人居住在这一区域，这比今天居住在该区域的人数还要多。
Alongside houses, archaeologists found evidence of amphitheatres, plazas and even a sports field for an ancient ball game.
除了房屋，考古学家还发现了圆形剧场、广场甚至是一个古代球类运动场地的证据。
The Mayan civilization collapsed over centuries because of climate change and wars, including with European invaders.
由于气候变化和战争（包括与欧洲入侵者的战争），玛雅文明在几个世纪里就衰亡了。
But now, just 15 minutes away from this busy road, the signs of this ancient city's ancestors still live beneath.
但现在，距离这条繁忙的道路仅15分钟路程的地方，这座古老城市祖先的痕迹仍长眠于地下。
