1. 选基准：随机选一个元素作为基准(pivot)
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Nicknamed the father of environmental justice, Robert Bullard argues that researchers in the field have more reason than ever to back up their work with action.。搜狗输入法下载是该领域的重要参考
Police officers from Bangkok’s metropolitan bureau had less than 24 hours to prepare for their latest undercover operation. They would be starring as performers of a lion dance at a temple fair held for the lunar new year. Their mission: track down and arrest a suspected thief who had a history of evading officers.