英语问题有这样一段话：To be an enthusiast had become her social vocatio

英语问题
有这样一段话：To be an enthusiast had become her social vocation and, sometimes even when she did not feel like it, she became enthusiastic in order not to disappoint the expectaions of those who knew her. The subdued smile which, though it did not suit her faded features, always played round her lips expressed, as in a spoiled child,a continual consciousness of her charming defect,which she neither wished, nor could, nor considered it necessary,to correct.
请问as后面为什么跟in,翻译这段话．