1. 书肺：多数的种类以外胚层形成的呼吸器官进行气体交换.水生的种类用鳃,或书...鳃(book gill)进行呼吸,书鳃是体壁表皮细胞向外的突起,或是体壁整齐...的折叠,用以增大体表与水接触的表面积.陆生的种类用书肺(book lung)
1. A price of three times book value is equivalent to paying HK $ 161.25 a share for Wing Lung, according to Merrill Lynch analysts.
据美林（MerrillLynch）分析师的计算，这部分股权帐面价值的三倍相当于每股161.25港元。
noun
1. organ in many arachnids containing many thin folds of membrane resembling the leaves of a book