媒体世界已经从广告支持的免费内容向免费增值模式转变：用免费的样本为付费服务做营销，重点在于附加收费部分。

In the media world, this has taken the form of a shift from ad-supported free content to freemium - free samples as marketing for paid services - with an emphasis on the "premium" part.

youdao

小册子可免费向邮局索取。

The leaflet is available free of charge from post offices.

《柯林斯英汉双解大词典》

我们向购买我们软件的顾客免费提供技术支持。

We offer free technical support for those buying our software.

《牛津词典》

They will be made available free to the public via the internet, so this is a way of allowing the world to benefit from what we all do at Yale.

它们会通过互联网向公众免费开放，这样全世界的人都能从耶鲁的课程中有所收获,我们要做的。

耶鲁公开课 - 1945年后的美国小说课程节选