An example of a detective question is as follows: Who is the real murderer? Answer: I don't know. Further investigation is needed. How to avoid a trap somewhere? Answer: Study the map carefully to understand the terrain and avoid possible traps. How to distinguish between real and fake jewelry? Answer: Observe the color, weight, shape, material, and other characteristics of the jewelry and analyze it according to the investigation on the spot. How to avoid a certain disease? Answer: Get the vaccine, maintain good living habits, and avoid contact with people who might be sick.