这是修订，使覆盖的用户权限。
盐的密度低于周围的岩石，所以会向上抬升，使覆盖其上的岩层形成穹顶状。
Salt has lower density than the surrounding rock, so it tends to flow upwards, pushing up the overlying layers of rock to form a dome.
独木舟合资企业是一家由有线电视领军供应商组成的联盟，由它主导的一个新举措旨在使全美于今年晚些时候实现互动广告的全覆盖。
A new effort led by Canoe Ventures, a coalition of leading cable providers, aims to make interactive advertising available across America later this year.
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