1. If there is a real voice behind the stone, it is equivalent to a conversation between two people. There is no difficulty. As long as you are familiar with the corresponding reply of "The Possibility of Historical Problems". You can also choose which direction to run in the back manually.

2. If there is no real voice dubbing, it is done by a machine. This needs a software, which is similar to our voice assistant, but it will be simpler than that.