December 11 marked 20 years since China joined the World Trade Organization (WTO). The WTO is currently facing formidable challenges. How do people view China's development and changes over the past 20 years? "Only when the world is good can China be good, and only when China is good can the world be better," said Chinese Ambassador to the WTO Li Chenggang, adding that China has grown into an important player on the WTO stage.