China has been described as an 'emerging economic powerhouse'.

中国被称为“崛起中的经济强国”。

《牛津词典》

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。

《柯林斯英汉双解大词典》

I assume that's because France is such a perennial economic powerhouse.

我想这是因为法国长期以来的经济强国地位。

youdao

Eclipsed by the economic powerhouse of Moscow, St Petersburg feels a bit like a large museum.

BBC: St Petersburg goes back to the future

For much of the 20th century, the U.S., the world's economic powerhouse, dominated the skyscraper scene.

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In the 1980s, CAL grew along with Taiwan as the island became an economic powerhouse.

CNN: How to Repair a Carrier