You 've never known yourself either .

你自己也永远不会知道。

The first person known to have a prosthesis .

这是已知的第一个安义肢的人。

This prescription-only medicine is best known as a treatment for acne .

这种纯处方药最著名的用途是治疗痤疮。

Real-time bidding helps solve these problems by allowing marketers to buy known audiences .

实时竞价系统通过允许市场营销人员购买已知的人群信息解决了这个问题。

Before long he became the best known boss in the country .

不久，他就成为了全国最知名的老板。