translation.en: There's a company making a product called Lotusan, which mimics -- when the building facade paint dries, it mimics the bumps in a self-cleaning leaf, and rainwater cleans the building.
translation.zh: 有一家公司生产一种叫做 Lotusan 的产品，它模彷了... 当建筑物外牆的粉刷干了之后，会有像叶子上能够自我清洁的突起， 然后雨水就能够将建筑物洗淨。