”曾经读过于丹的一篇文章，题目叫做《读书和行走是我的两个翅膀》。
O O O O O B-Person I-Person O O O B-Thing I-Thing O O O O O B-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract O