卫星图像显示：美伊关系紧张之际，伊朗正修复并加固多处设施

Group 1 - Recent satellite images indicate that Iran has constructed a concrete protective layer over a new facility at a sensitive military base, accelerating construction amid heightened tensions with the U.S. [1] - The images also reveal that Iran has filled in the entrance to a nuclear facility that was bombed by the U.S. during a 12-day conflict with Israel last year, reinforced another nearby tunnel entrance, and repaired a missile base that was attacked during the conflict [1] - These developments highlight Iran's activities at key facilities in a region where tensions with Israel and the U.S. are significant [1] Group 2 - Washington is currently seeking to negotiate an agreement with Tehran regarding its nuclear program, while threatening military action if negotiations fail [2]