You know, you've seen, and there are some products where they sell themselves as no-ad products.

你知道，你也见过，有的产品销售的时候号称无广告产品。

广告和价格的关系 - SpeakingMax英语口语达人

In their silence they were themselves. "They"ve only recently learned to sell these crystals since the highway was built about ten years back.

只有在平静中，她们才显露出自己的真实面目,“她们是在最近才学会卖这些水晶石的，大概是10年前。

耶鲁公开课 - 1945年后的美国小说课程节选