知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。Early 70s scifi novel about underground people, caste is decided by the colour of your poncho, and everyone eats mouldy grainGrow Your Interests: To attach with a various array of people, think about broadening your own private pursuits. Exploring n