But this book, the last one, are both about big problems: cooperation, foreign intelligence.

但是这本书是后一本，这本书讨论了重大的问题：合作，对外情报。

youdao

But this book, the last one, are both about big problems: cooperation, foreign intelligence.

但是这本书是后一本，这本书讨论了重大的问题：合作，对外情报。

youdao