- ben. - what?

-本 -怎么了
Look at this.

看这里
- see that? - oh.

什么
- that's quite something, isn't it? - yeah. lt says ''smudge.''

-貌似有什么东西吗 -是啊上面写着 "污迹"
Lt's nothing.

没有东西啊
Residual ink from the facing page. flip it.

反面似乎有墨汁的痕迹翻过来
The letters are backwards.

字母是倒过来写的
- lt's a cipher. - yes. lt is.

这是密码是啊
A cipher. see how the letters are coupled?

这是个密码看见这些字母是怎么组合的吗
Playfair ciphers encode letters in pairs. this could prove his story.

普莱费厄密码都是这样配对的这可以证明他的话
Unless you decode the cipher, this does not prove a theory.

除非你可以破译这密码否则根本没用
That's ok. we need a five-letter keyword.

可以可以只要有个五个单词的一句线索