() the area where a particular service is provided （提供某种服务的）范围◆Mobile-phone coverage is limited to the big cities. 移动电话的服务范围限於大城市。◆The deal gives the airline coverage across the whole country. 这笔交易可让航空公司在全国提供服务。
() the percentage of a possible audience for an advertisement, etc. who see it at least once 广告覆盖面