If one were to ignore all other information, that since the United States can produce more goods per hour than China, we ought to focus on it. Although I disagree with you, I can understand your way of thinking. Nevertheless, the story is more complex than that. In order to include television in the comparative advantage, you would also need to consider the opportunity cost. It might be more cost-effective to import televisions while the US focuses on other products because the opportunity cost could be greater in the US than in China. Opportunity cost is what you forfeit in order to obtain it. Given that trade has the potential to improve everyone's situation. I hope this makes sense and explains why, in reality, the cost of labor in China plays a significant role in determining comparative advantage.