She arranged every book on the shelf fussily, making sure they were perfectly aligned.

book的意思是"书"，指装订成册的印刷品。 fussily是形容词fussy的副词形式，fussy意思是"过分讲究的、爱挑剔的"，加上-ly变成副词，表示"过分讲究地、挑剔地"这个动作方式。