"A structured system of knowledge."
"Hmm... I like that phrase, there are always some fools who treat science like it's the medieval church's silverware and holy water against demons," Albert complained nonstop.
"How do you ensure that the broadcast will be heard by humans?" Lu Li asked calmly. Unable to probe Inverted City, it was impossible to tell whether he was human or something strange.
"Answer time is over, kids, now listen to me," Albert interrupted Lu Li's question, picking up the machine on the table that was the size of an adult's fist, with gears and wires exposed, looking like two identically constructed devices forced together: "The Evil Spirit Broadcast Prototype, we all know that different demons release their unique electromagnetic frequencies - it's okay if you don't know, just remember this term."
Anna looked up, seeking Lu Li's interpretation with her eyes.
"It can be understood as the different auras of different demons."
