world power

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The nation declined as a world power.
作为一个世界强国，这个国家已经衰落。
《新英汉大辞典》
It’s history as a world power and its unique cultural environment in the heart of Europe have generated contributions to mankind in every possible field.
其作为一个世界强国的历史和其处于欧洲的中心的独特的文化环境，使它在几乎每个领域都对人类作出了贡献。
Our trade and economic policies have not served the interest of the United States as a world power by delivering the good jobs or completive edge that we must have.
他说：“我们的贸易和经济政策没有为作为世界强国的美国的利益服务，也就是创造良好的就业机会，或者我们必不可少的竞争优势。
www.voanews.com.cn

The results of the Boxer Rebellion and the Spanish-American War made clear that the new century would have a new world power: the United States.
The Netherlands ceases to be a great power, whereas Britain in 1707 becomes the biggest of the world powers.
随着荷兰的衰落,一七零七年,英国成为了世界的霸主
耶鲁公开课 - 欧洲文明课程节选
We must wonder whether the power of modern weapons will allow it and the world to survive at such a price.
我们必须质疑现代武器的力量能否,维系自由和这个世界的存在
耶鲁公开课 - 古希腊历史简介课程节选

Australia is hardly a world power and it is a long way from... well, from anywhere.
NPR: Consultants Develop Notion of Branding Nations

a country that has enough economic or political strength to influence events in many other countries

a state that possesses sufficient power to influence events throughout the world