Let's challenge some extreme tourisms.

让我们挑战一些极限旅游。

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More than 5, 000 competitors from around the world took part in the Tough Guy Challenge over an extreme obstacle course on Sunday in Perton, South Staffordshire, UK.

周六，英国特尔福德镇，来自世界各地的5000多名竞争者参加了硬汉挑战赛，他们正在跨越极限障碍。

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From heat stress to sewage overflows, climate change promises to bring extreme weather that will challenge the ill-prepared U.S. public health infrastructure.

从高温天气到排水系统崩溃，气候变化造成的极端天气将对美国本身并不健全的公共卫生设施造成威胁。

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It's an extreme challenge to build a repertoire, but when you have five, six, seven guys making collective decisions, it's a powerhouse.

WSJ: Clap Hands for Superhuman Happiness | By Jim Fusilli

YouTube even has a number of teens doing the extreme cinnamon challenge- ingesting well more than a tablespoon- which has motivated more teens to attempt this dangerous stunt.

FORBES: An ER Doctor's Perspective on "The Cinnamon Challenge": Don't Even Think of Doing It

But also, the disadvantages of growing up in extreme poverty pose a challenge to a belief in equality of opportunity.

ECONOMIST: Inequality