A seven-word tweet in support of Hong Kong’s antigovernment protests by Daryl Morey, general manager of the Houston Rockets, triggered a furor in both China and the United States. The ensuing controversy revealed the unspoken rules of doing business with Beijing. Guest: Jim Yardley, the Europe editor of The New York Times and author of “Brave Dragons: A Chinese Basketball Team, an American Coach, and Two Cultures Clashing.” For more information on today’s episode, visit nytimes.com/thedaily. Background coverage: