When you're reading your book, the type can mysteriously disappear.

阅读时，书上的字可能神秘地消失。

Even if every single television station in the world were to mysteriously disappear, Oprah would still have a job. A very lucrative, successful job.

即便是世界上每个电视台都神秘消失了，奥普拉还是会有工作，非常赚钱而成功的工作。

The guerrilla units mysteriously appear and disappear in operation behind enemy lines, without the enemy's being able to do anything about them.

游击队在敌人后方神出鬼没地活动， 敌人无奈他何。

We also travel with expensive gear (cameras, laptop), and I don't want it to disappear mysteriously.

我们也带着昂贵的设备(照相机，笔记本)旅行，我不想让它显得神秘。