布达拉宫，为什么建在山上？

The Potala Palace sits on Red Hill. 布达拉宫建在红山上。 It stands high above the whole city. 它高高在上，俯瞰全城。 Building it on top made it look grand. 建在山顶上，显得特别雄伟。 It was also hard for enemies to attack. 敌人想打它也很难。 White and red walls climb up the slope. 白墙红墙顺着山坡往上长。 It is a famous treasure of Tibet. 它是西藏的珍宝。