语音讲解：
　　　(点击右键“另存为”可下载语音)

　　Be bound to

　　一定

　　be sure to

　　必定

　　If you can't find the book in the bookstores，there's bound to be a copy in the library.

　　如果你在书店找不到那本书，图书馆一定有一本。