那些沉积物是缓慢的自动流动，而在过去半个世纪大约5万个大型水坝拦断了河流，这种流动减少了将近五分之一。

That sediment flow itself, meanwhile, is shrinking; almost 50,000 large DAMS have over the past half - century cut the flow by nearly a fifth.

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一天下午在开车时我驶过了一个停车指示牌被一位警官拦到路旁。他认出来我是他过去的英语老师。

Driving my car one afternoon, I rolled through a stop sign. I was pulled over by a police officer, who recognized me as his former English teacher.

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在过去的一百年间，土地使用的规章制度大量增加使建设许可变的申请变得十分困难，甚至比在下雨的午后从伦敦街上拦出租车还难。

Over the course of the past century land-use rules have piled up so plentifully that getting planning permission is harder than hailing a cab on a wet afternoon.

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