外媒：美军正做准备，一旦特朗普下令攻击伊朗，行动可能持续数周

Group 1 - The U.S. military is preparing for potential military actions against Iran, which could lead to unprecedented conflict between the two nations [1][3] - Current military planning is more complex, with potential strikes targeting Iran's nuclear infrastructure, national institutions, and security facilities [3] - Experts warn that attacking Iran poses higher risks for U.S. forces due to Iran's strong missile arsenal, and retaliatory strikes from Iran could escalate regional conflicts [3][4] Group 2 - The U.S. has been increasing pressure on Iran by deploying multiple naval assets, including the USS Abraham Lincoln aircraft carrier, to the Middle East [3] - Iran has stated that it will retaliate against U.S. and Israeli targets in the region if attacked, with approximately 40,000 U.S. troops stationed in the Middle East [4] - Both the U.S. and Iran have expressed a desire to continue negotiations regarding nuclear issues, although the war alert remains active [4]