in itself

例句：

1. 1.The book is written in English and French.
   这本书是用英语和法语写的。
2. 2.He is in the library alone.
   他独自在图书馆里。
3. 3. She was in her own world when she heard the news.
   她听到这个消息时，正沉浸在自己的世界中。