Environmental campaigns that tell us how many people drive SUVs unwittingly imply that this behaviour is widespread and thus permissible.
环保运动告诉我们有多少人不经意地驾驶 SUV，这意味着这种行为是普遍的，因此是允许的。
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In a report released last December, the U.S. Department of Energy estimated that widespread use of electric-drive vehicles and offshore wind farms could cause shortages of these metals by 2015.
Only one widespread shortage is known to have affected the Zune in the past, when in December 2007 the company had low supply of the hard drive-based Zune 80.