The various factors have to be controlled just right, and the personnel in charge have to observe what's going on constantly and make adjustments accordingly. The methods differ from breed to breed, and the whole process is truly easier said than done.
這其間火候的控制得非常嚴謹，所以現場人員必須定時觀察它們、視實況而修正腳步，每種畜禽的方式又不盡相同，真可說是「知易行難」了。