power house
柯林斯词典
1. N-COUNT A powerhouse is a person, country, or organization that has a lot of power or influence. 权威人士; 强国; 权势集团
Nigeria is the most populous African country and an economic powerhouse for the continent. 尼日利亚是非洲人口最稠密的国家，也是非洲大陆的经济强国。
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