translation.en: And so, like many people, we start with a house on a lot, and I'm going to show you a typical construction on the top and what we're doing on the bottom.
translation.zh: 所以，就如同很多人一样， 我们从普通的房子开始， 同时我会向你们展示一个普通房顶的建设过程 而且我们在底下做什么。