"That's for certain. It's just that in this world, you need to learn quite a bit more." Unlike her, she was from the apocalypse, and although there were zombies, the level of knowledge and technology from the apocalypse was much higher than here. Plus, she had once been the Supreme Commander and knew a lot. This caused her to not need to learn many things in this world.
But he was different. Although he was Doctor Bai, he had lost Doctor Bai's memories due to being forcibly transferred to her space. So, even though he often visited the apocalypse and knew how to use smartphones and computers, he had never systematically studied the knowledge from the apocalypse. In this world, he had to start learning many things from scratch.