Yoga: Yoga has become one of the most popular classes in today's fitness world.

瑜伽是当今世界上最热的健身运动之一。

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But researchers say more studies are needed to fully understand the potential impact of using these two popular classes of drugs together.

但是研究人员说需要更多的研究来充分地理解同时使用这两种常用药的潜在影响。

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If the crisis is to lead to anything other than complete defeat for the global popular classes, poverty, exploitation and war, the popular classes must mobilise.

如果这场危机所带来的不是全球大众阶级、贫困、剥削和战争的结束，那么我们必须立即动员行动。

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Her two classes were so popular, students had to be chosen from a long list.

VOA: special.2010.05.09

My biggest personal surprise in online learning came several years ago when I learned that one of the more popular classes that the Florida Virtual School offers is online physical education.

FORBES: Physical Activity and Digital Learning: Two Peas in a Pod

In some of the most popular group classes, movements have nicknames plucked from the intersection of innuendo and Urban Dictionary.

FORBES: Bright Lights, Big Fitness: The Business Of Keeping Broadway In Shape

Much like the wine-tasting classes that have long been popular around the world, students at his classes are taught how to recognise the smell of a good beer, how to describe its taste and how to pair different types of beers with food.

BBC: Krakow brews a beer scene of its own