President Bush says he attribute (his trip to) Africa was the most *exhilarating of his presidency, because the American is humping (helping) a new generation of Africa leaders change the continent.

• 布什总统说非洲之行是他执政期间最快乐的一次旅行，因为美国帮助新一代的非洲领导人改变了整个非洲大陆。