Hong Kong's education system, run by the British, charged school fees of HK $ 8 per month. If you couldn't pay one month, you had to sit out the next. On this basis, Niu Gur had to sell 12 cartoons a month just to pay his tuition.
香港的教育制度是英國式，學費是按月繳的，每個月港幣八元，一個月繳不出學費，下個月就要輟學；照這樣計算，牛哥需要發表十二幅漫畫才夠繳學費。