唯一的限制是你的思想。
There are other reasons --There are other reasons why it's perhaps harder now to feel calm than ever before. One of these, and it's paradoxical, because it's linked to something that's rather nice, is the hope we all have for our careers. Never before have expectations been so high about what human beings can achieve with their life span.
江河的水之所以浩浩荡荡,并非只由一个源头流出来;无比珍贵的皮衣,并非只由一只狐狸腋下的毛皮所能制成。