求翻译：国家战略主导投资模式是指我国一些大型能源企业开展海外投资主要是政府的推动，注重的是国家的宏观利益是为国家经济的可持续发展和国家能源安全的需要而向海外资源开发方面进行的投资。海外能源开发投资是落实国家能源安全战略的重要步骤，这类投资需要巨额资金投入，投资回收期限长，投资风险大，需要政府来推动和承担主要风险。是什么意思？

National strategy for leading investment model refers to the large energy enterprises overseas investment in China is mainly Government promotion, focus on the macro interest of the State is one of the national economic development and national energy security needs for investments to the development of overseas resources. Overseas energy development investment is the important step in the implementation of national energy security strategy, such investments require huge capital investment, long payback period, investment risk, requires the Government to promote and take major risks.