最近,美国总统奥巴马在华盛顿乔治敦大学发表演说时提出,美国要逐步提高自身的能源独立性,目标是到2025年将减少石油进口1/3,实现“能源独立”。虽然外界对于奥巴马的讲话评论不一,但在越来越复杂的国际形势下,不论美国还 In a speech recently delivered by Georgetown University in Washington, U.S. President Barack Obama proposed that the United States gradually improve its energy independence with the goal of reducing oil imports by one third by 2025 and achieving “energy independence.” Although the outside world comments differently on Obama’s speech, in the increasingly complicated international situation, both the United States