特朗普发布“金穹”导弹防御系统发展规划 称加拿大也想加入

Group 1 - The core idea of the news is the announcement of the "Iron Dome" missile defense system development plan by President Trump, which aims to be fully operational within three years [1][2]. - The total estimated cost of the "Iron Dome" system is approximately $175 billion, with an initial funding of $25 billion proposed in the upcoming fiscal budget [2]. - Canada has expressed interest in participating in the project, with discussions ongoing regarding their financial contribution and role [2]. Group 2 - The project has been a priority for Trump since he took office, with a commitment to establish a defense system similar to Israel's "Iron Dome" [3]. - There are significant technical challenges associated with building such a system across the vast U.S. territory, making it more complex than Israel's defense against smaller rocket attacks [3]. - Experts warn that the actual cost of constructing the system could exceed initial estimates, potentially reaching $542 billion [3].