How to explain their enduring popularity?

我们如何解释她们作品的长盛不衰呢？

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For less celebrated brands there's a reason for the enduring popularity of mugs and pens.

对于一些没有那么大名气的品牌而言，杯子与笔的经久不衰是有道理的。

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A testament of their enduring popularity: One million Smurf DVDs were sold last year alone, Coysman said.

考伊斯曼说，《蓝精灵》DVD仅去年一年的销量就达到了100万，这足以证明“蓝精灵”的长久生命力。

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The enduring popularity of the Selfridges store on Oxford Street is a great tribute to him.

FORBES: Selfridges: A Shopper's Paradise With A Colorful Founder

The Muppet Show made its TV debut in 1976 and has enjoyed enduring popularity.

BBC: Muppets designer Jane Henson dies

That many politicians aspire to this status explains the enduring popularity of the U.S. antidumping law in Washington.

FORBES: Tomatoes, Furniture, and Shrimp: Is Extortion the Main Purpose of the Antidumping Law?