Large department stores are busy setting up their own TV channels to encourage
TV shopping in the future customers 。Customers can ask questions about products and place orders all through their TV sets。
好,提出我的疑问。这段话大意不难明白。在“all through their TV sets”中的all的详细用法。请亲们,从语法角度联系句子详细解析!有建设性延伸就更感激了!