And he actually says that he didn't intend for "Wool" to become a series, but that the audience loved the first story so much they demanded more, and so he gave them more.
他说他实际上根本没打算 把"羊毛"变成一个系列， 但读者那么喜欢第一个故事 他们要求续集，所以他给了读者续集。