book lung

例句：

1. 1. The book's lung isthe heart of the story, driving itsemotional journey.
   这本书的生命力是故事的核心，推动着它的情感旅程。
2. 2. The author's words are like a book'slung, filling the reader with inspiration andhope.
   作者的话语就像一本书的生命力，给读者带来灵感和希望。
3. 3. The book's lung is essential for sustaining thestory's momentum and keeping it engaging.
   这本书的生命力对于维持故事的动力和保持其吸引力至关重要。