So it's not just the end user that you're thinking about, but everyone who interacts with the product, so, for example, the prosthetist who fits the knee, but also the context in which the knee is being fit.
所以不应该只考虑产品的最终用户， 更要考虑每一个与产品打交道的人， 比如说，安装这种假膝的修复专家， 还有这种假膝会被用户们使用的环境。