translation.en: You'd think, there's plenty of paralyzed people in the world, but the audience is too small, and the amount of research, the time it takes, the FDA clearances, the payback time is too long for V.C. to be interested.
translation.zh: 你想说，世上有很多瘫痪的人 但是目标人群太小 而大量的研究和时间 FDA 的许可证 投资回报期太长 风投者没有兴趣