For the adult world (that a child so ardently desires to attain is lso a world in which freedom) is greatly modified by circumstances, by concrete obigations and limitations.괄호 친 부분이 앞의 주어인 the adult world를 수식하고 동사는 is인 것 같은데이 상황에서 For가 왜 나왔는지 몰겠어요~~