What do 4, 3, 1, 7 and $700 billion mean to you? Well, through this seemingly random set of numbers, we can see the opportunities and challenges from U.S. Commerce Secretary Gina Raimondo's China visit. This episode of Reality Check breaks them down for you and analyzes the result of Raimondo's visit to China. Establishing a working group and initiating an information exchange mechanism is important to the China-U.S. relationship, but how to strengthen mutual trust is the most crucial question that needs to be answered. When Raimondo departed China, she said that she was "leaving with some optimism" and that the two countries would continue dialogue and seek resolution to problems. One does hope that she keeps her word.