Task: Question Understanding
Input (English): Passage: The Tibetan Plateau , also known in China as the Qinghai-Tibet Plateau or the Qing-Zang Plateau  or Himalayan Plateau, is a vast elevated plateau in Central Asia and East Asia, covering most of the Tibet Autonomous Region and Qinghai in western China, as well as part of Ladakh in Jammu and Kashmir, India. It stretches approximately 1,000 kilometres  north to south and 2,500 kilometres  east to west. With an average elevation exceeding 4,500 metres , the Tibetan Plateau is sometimes called "the Roof of the World" because it stands over 3 miles  above sea level and is surrounded by imposing mountain ranges that harbor the world's two highest summits, Mount Everest and K2, and is the world's highest and largest plateau, with an area of 2,500,000 square kilometres  . Sometimes termed the Third Pole, the Tibetan Plateau contains the headwaters of the drainage basins of most of the streams in surrounding regions. Its tens of thousands of glaciers and other geographical and ecological features serve as a "water tower" storing water and maintaining flow. The impact of global warming on the Tibetan Plateau is of intense scientific interest.
Question: How many different names are the Tibetan Plateau known by in China?
Output (English): number