a way of doing business, especially on the internet, in which basic services are provided free of charge while more advanced features must be paid for 免费增值模式(尤指互联网上的一种商业模式,免费提供基本服务,而更高级的功能则收费) Other sites use a freemium model where some content is free in order to entice people to pay for premium content. 其他网站采用免费增值模式,免费提供部分内容,以诱使用户付费获取高价值内容。