translation.en: And we've been able to develop a knee, a polycentric knee, so that type of knee that acts like a human knee, mimics human gait, for 80 dollars retail.
translation.zh: 我们现在已经有能力去开发一种 多中心的假膝，这样它就能够模仿 人类原本的膝盖，模仿人类原来的步态， 并且以80美元的价格零售。