translation.en: And now, those profit margins are critical, because if you want to scale, if you want to reach all the people in the world who possibly need a knee, it needs to be economically sustainable.
translation.zh: 谈到这里，利润是很重要的， 因为如果你想要得到最大收益，或者想要 触及到世界上每一个可能需要一副假膝的人， 它必须是能持续获益的。