Her enquiries after her sister were not very favourably answered. Miss Bennet had slept ill, and though up, was very feverish and not well enough to leave her room. Elizabeth was glad to be taken to her immediately; and Jane, who had only been withheld by the fear of giving alarm or inconvenience, from expressing in her note how much she longed for such a visit, was delighted at her entrance. She was not equal, however, to much conversation, and when Miss Bingley left them together, could attempt little beside expressions of gratitude for the extraordinary kindness she was treated with. Elizabeth silently attended her.   

请教老师：这一句who had only been withheld by the fear of giving alarm or inconvenience, from expressing in her note how much she longed for such a visit

老师能否讲解一下 sth withhold sb from (doing) sth 这一结构是什么含义？上面，sth= the fear of giving alarm or inconvenience,

即  (the fear of giving alarm or inconvenience) + withhold + sb (Jane) + from (doing) sth ，对吗？主要是这个结构的含义是什么？(结构sth withhold sb from (doing) sth).

谢谢老师！