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'Last Call' Sounds Water Alarm in Dry World You dont have to be a scientist to understand if you take more water out of the bathtub than you put into the bathtub, the bathtub will eventually go empty, marine biologist Tim Barnett says in the film. Th
发表于:2019-01-13 / 阅读(136) / 评论(0)
VOA标准英语2012年(五月)
VOA标准英语2012年(五月)
GWEN IFILL: Now NewsHour science correspondent Miles O'Brien begins a two-part look at America's drinking water, and the regulatory system that is supposed to guarantee its safety. His report is the result of a partnership with the Center for Public
发表于:2019-01-27 / 阅读(124) / 评论(0)
PBS访谈环境系列
PBS访谈环境系列