To use Cache-Control headers, choose Content Management | Cache Control Directives in the administration server.
使用Cache-Control头信息,在管理服务器上选择内容管理|缓存设置目录。
Choose content of interest, that you want to listen to and read. Seek out the words and phrases that you need to understand your listening and reading.
选择你感兴趣的内容来练习听力和阅读,找到能理解听力和阅读内容的关键词和短语。
DRM technology becomes an obstacle to users' goals to use the content on the devices they choose, or to try out the content before they buy.
DRM技术成为了实现用户目标的障碍,用户将不能在其选择的设备上使用内容或在购买之前先试用内容。
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