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.
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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