英语听力:自然百科 古格:消失的西藏王朝—8(在线收听

 Being so high also made the power’s perfect strategic location, the sheer cliffs on three sides, and the steep summit made the city door virtually impregnable. 

 
(From here the slopes are very steep, any invaders would find it almost impossible to climb up.)
 
John Bellezza and Tsering Gyalpo believe that this is where the mystery slowly begins to unfold. What stories could these weathered walls tell? Perhaps an answer to a question that stymied experts for decades. How did the royals of Guge made their way to the top of the acropolis? Certainly not the steep 30 minute high cupped narrow craggy paths used by commoners. 
 
Tsering thinks he may have discovered a clue to this mystery. At the far end of the royal complex is a wide open space which for years experts assumed was a reception hall for the king. But after analyzing the soil composition there, Tsering found traces of horse hair and manure.  
 
(When you study the ground, you can discover horse manure in the soil, some people believe that this manure has sacred properties.) 
 
But if indeed there was a stable high on this mountain, the question still remains. How could these horses have made their way 300 meters to the top of the citadel?
  原文地址:http://www.tingroom.com/lesson/zrbaike/2013/282063.html