Ключевые слова: agriculture, amino acid, animal husbandry, blue, china, closeup, crushing, cultivation, economy, field, forage, harvest, harvester, health, high quality feed, high speed, horticulture, industry, intensive, machinery, mechanization, metal, modernization, north china, nutrition, oats, outdoor, planting, protein, season, sky, summer, sunny, technology, transportation, vehicle, weather,