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.

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。

youdao

Your AD in today's China Daily interests us and we will be glad to receive samples with your prices.

对你们刊登在今天《中国日报》上的广告，我们很感兴趣。如能寄来样品并附上价格，不胜欣慰。

youdao

To predict reactions of a broader public, 31 subjects interested in quitting smoking were recruited for a focus group to evaluate samples from three antismoking ad campaigns: A (a humorous effort that empathized about the difficulty of the task), B (more serious but also empathetic), and C (lighthearted).

WSJ: Smart Blankets, Brain Waves About Ads and College Paperwork | Week in Ideas

The preserved timber means that tree ring samples will provide dendrochronological dating for Roman London, expected to be earlier than the current dating of AD 47.

BBC: 'Entire streets' of Roman London uncovered in the City