centre punch,玉米,Corn,玉米穗,Corncob,金色,Golden,农业,Agricultural,植物,plant,绿色,green,agriculture,农活,Farming,useful plant,田地,field,蔬菜,vegetable,种植,cultivation,收割,reap,活塞,piston,产品,product,energy source,圆块,Cob,黄色,yellow,自然,nature,谷物,Grain,谷类食品,cereal,alternative en