Director Xiao: "... The toxicity of cowpox is much smaller. Can cows still successfully contract smallpox? When inoculating human pox, we need to specially prepare the pox vaccine."
Manbao said: "Let's give it a try. After all, we are not lacking in pox vaccine right now, just a few cows. We should try all methods and consider others if they don't work."
Director Xiao thought for a moment, finding no fault with the words, so he nodded and added another allotment. But after doing so, he hesitated, "It seems we don't have cows that came from the Western Regions anymore."
Manbao sighed, "Yes, what about those from the grasslands? My family estate has some cows brought from the grasslands."
"Are grassland cows the same as those from the Western Regions?"
"Not exactly the same, but they are closer to us. Maybe they are related?"
Director Xiao: "... All the cows in the world are relatives."
