美国正式退出世卫组织，留下一笔数亿美元巨额未付账单

Group 1 - The core viewpoint of the article highlights the formal exit of the United States from the World Health Organization (WHO) after one year of application, alongside significant unpaid dues amounting to approximately $260 million [3][4] - The U.S. owes $130 million for the 2024 annual dues, which constitutes about 22% of the expected total contributions to the WHO for that year [4] - WHO Director-General Tedros Adhanom Ghebreyesus expressed concerns that the U.S. exit poses threats to both U.S. and global security, describing the situation as a "lose-lose" scenario [4][5] Group 2 - The WHO is facing a budget shortfall of nearly $600 million for 2025 due to reduced funding from the U.S., leading to proposed budget cuts of 21% for 2026-2027, decreasing from $5.3 billion to $4.2 billion [4] - The organization plans to reduce its workforce by over 2,000 positions, nearly a quarter of its staff, as part of budget adjustments and structural reforms [4] - The annual World Health Assembly is set to discuss the exits of the U.S. and Argentina, which has also announced its intention to leave the WHO [5]