How Trade Liberalization of Intermediates Contributes to China's Technology Upgrade Will Market-Oriented Reforms Propel Technology Progress?Empirical Evidence from China's High-Tech Sectors China-U.S. Trade Balance from the National Income Perspective Structural Upgrade of China’s Commodity Trade during 1987-2014 Value-Added Trade and Evolution of China's Comparative Advantages China’s Service Trade and Dwindling Current Account Surplus How the African Public Views China's Aid to Africa Evolution of Technology Content in China’s Exports and International Comparison Is China’s Foreign Investment Policy to Blame for US-China “Forced Technology Transfer” and Trade Conf lict?——Comment on Trump Administration’s Section 301 Investigation of China Re-Evaluation of China’s Service Trade Competitiveness: A Global Value Chain Perspective