This photo focused on vendors outside the Potala Palace in Lhasa , Tibet.这张照片的主题是布达拉宫外的小贩们.What was the course of building the Potala Palace in history?历史上修建布达拉宫的过程是怎样的?What parts does the Potala Palace mainly contain?布达...

布达拉宫...

the Potala Palace的音标：...