The deficit and surplus should be dialectically seen. The trade balance is always relative and dynamic. Sino-US economic and trade relations are win-win rather than zero-sum, and economic complementarity destined that the US-China deficit will be a long-term problem. In the future, the degree of China's participation in globalization and the intra-product division of labor will continue to deepen. As long as the current statistical methods are not changed, the U. S. deficit with China will continue, and the scale of China-US trade and economic cooperation will continue to expand. What is the core point expressed in this passage? ['China and the U. S. economy are complementary.', 'The deficit or surplus depends on the statistical method used.', 'US trade deficit with China will not change.', 'US trade deficit with China should not affect Sino-US economic and trade relations.']