in the eerie silence of the cavern,the only sound that could be heard was made by water which dripped continuously from the high dome above them,这里的in the eerie silence of怎么理解,OF前后啥关系啊,above them指的是社么,To protect themselves from the icy water,这里的TO怎么理解,不是介词后要跟,ING形式么,