Yuzuki gave this a little more consideration.
She took another forkful or so. 'Or so' turned out to be most of the remaining eggs on the plate, and in very short order she found herself eyeing the sausage, sitting so unassuming beneath the gradually thinning puddle of sausage gravy. It had no idea that it was about to die, again, after a rigorous series of internal Yuzuki processes which would, inevitably, turn it into waste liquid. She stalked it.
Then she remembered, again, that she was not alone.
"Yes," she said, simply, hesitating. Table manners were fighting for dominance. The tide of battle could go either way. "I can. Most mechanical... err, most... things like this operate one of three ways. Mechanically, hydrolically, and pnumatically."
Somehow, her stomach had lost, so she decided with a sort of anxious, harried determination to press on.
"A mechanical system is more often found in larger products. Products that have to move a lot of weight or are going to be placed under a lot of stress. Helical gears, bevel gears, probably a few drivetrain assemblies just to translate it. Most often they're just used for repetative activity, something like cranes. The field of movement is very small. Then there are hydrolic and pnumatic systems which are controlled by a series of pumps or compressors, which would pressurize or depressurize based on the demands of the system. It's loud but it works. That's why..."
Yuzuki stopped and stared at her plate.
Internally, she continued, but her mouth had shut after her brain had realized where this was leading. It was an evolution - mechanic, hydrolic, pnumatic... It's how people had built robots, way back in the day; they had been clumsy things, barely able to follow simple electronic instructions, but that had been that for the longest time. The dark truth was that there weren't really just three systems. There were four.
The fourth was synthetic muscle, sinew, and bone, guided by complex electrical impulse - the first Nekovalkyrja. Probably, whatever Kai had brought back, would be some derivative. She had talked herself into a corner. It was a different corner than she had experianced yesterday, but it was still, undeniably, a corner she did not want to be in.
"Yes," she repeated when she realized she had fallen silent. "Yes. I could."