When it comes to the concepts of "hot" and "cold", Haydn Fogel, a foreign journalist at China Daily, thinks of sitting in front of an electric fan on a hot summer day, sweating profusely. But within the framework of traditional Chinese medicine, hot and cold have their own unique meanings. How should one explain this to foreign friends? Fogel visited China-Japan Friendship Hospital in Beijing to find out. Click on the video to hear the professional analysis.