Only a few years ago more than half of the 10,000 miles (16,000km) of water pipes below the streets of London were over a hundred years old and often burst.

就在几年前，伦敦街道下面10000英里（16000公里）长的自来水管中的一半已经过了百岁，经常爆裂。

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Meanwhile, more than half a million pipes burst every year, according to the American Water Works Association, and more than 6 billion gallons of water are lost to leaky pipes.

同时，据美国水工程协会（American Water Works Association）报告，每年有超过五十万根管道发生爆裂，并且由此导致的泄漏有60多亿加仑。

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Delhi loses about half the water it gets to leakage, from both decaying pipes and theft, and what's left isn't evenly distributed.

德里由于渗漏失去了它所得到的近一半的水，原因既有水管老化还有偷窃，剩下的水也没有被平均分配。

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He has parlayed his success on snow and half pipes into Hollywood film roles and huge endorsement deals.

FORBES: Connect

The joints between the half-pipes have rubber seals to stop the contents leaking, and each half-pipe has a vertical pipe connected to it, to introduce or dispose of the fluid concerned.

ECONOMIST: Monitor

Take William Stein, a University of Washington math professor who grew up skating vertical half-pipes in the 1980s.

WSJ: I Say, That's One Gnarly Grind You Just Executed