美国学者：美国在全球的角色不再独一无二

Group 1 - The current geopolitical tensions are exacerbated by the policies of the Trump administration, indicating that the U.S. is no longer the sole dominant power globally [1] - The rise of trade protectionism and geopolitical conflicts has led to discussions on achieving stable development and the potential establishment of a new international order at the 2025 Summer Davos Forum [1] - The world is entering a period of unavoidable turmoil, with increasing geopolitical tensions, and the U.S. is facing challenges from rising powers like China and the EU [1] Group 2 - The U.S. has withdrawn from multiple international organizations and global agreements, such as the Paris Agreement and the World Health Organization, which may weaken global multilateral cooperation [1] - Despite the U.S. absence, there is optimism for international cooperation as long as other countries strengthen collaboration based on mutual trust [1] - Countries are encouraged to maximize international cooperation in areas that align with their interests to avoid a crisis similar to that of the 1930s [1]