translation.en: Now let me say something about the staircase, which may seem like an odd metaphor for seniors given the fact that many seniors are challenged by stairs.
translation.zh: 首先我先针对楼梯说两句， 这听上去象是个对老年人打的奇怪的比喻 而对于很多老年人来说，楼梯确实个挑战。