The Qingniu Medical Hall's "Sweet Prevention Mobile Tutorial Class" had just arrived in Peach Blossom Town, turning the schoolhouse into a candy shop. Huwa had modified the desks into the shapes of green oxen that could recite the *Essential Prescriptions Worth a Thousand Gold*. When the students tapped the desks, peppermint-flavored prevention formula candies popped out from the desk drawers. The blackboard transformed into a "talking garlic" that droned in Huwa's voice: "If you don't eat garlic with a zeal, your ideology needs an appeal!"
"Look here, everyone!" Huwa shouted through a megaphone while walking on stilts, half of an unfinished garlic steamed bun sticking out of his pants pocket. "Today I'm going to teach you how to use sweet tricks to keep dysentery bacteria thoroughly tamed!" No sooner had he finished speaking than the yak led in by the Tibetan apprentice Dawa suddenly started speaking with a Chang'an accent: "Don't spit everywhere, add alum to the spittoon!" It turned out Huwa had secretly installed a voice mechanism in the yak, startling the onlookers into rubbing their eyes in disbelief: "Could this ox... have turned into a spirit?"
At the sweet prevention demonstration teaching site, Huwa turned the "garlic steamed bun" into a "mobile classroom." When broken open, the bun revealed itself to be a textbook engraved with prevention formulas from *The Nine Chapters on the Mathematical Art*, and hidden inside the pages was a mechanism that could spray disinfe…
Chapter 504