In order to buy the best quality butter, Chew Chong offered a prize for the keg of butter which was opened in best condition after being stored for three months.
為了買到品質最好的奶油，張朝想出一個獎勵辦法：有誰的奶油能夠在三個月後開封時品質不變，就可得到他所提供的獎品。