Such gentlemanly advice elegantly pinpoints the faults most people are liable to display. These days the NT $ 300 mahjongg sets generally available in Taiwan tend to be made of urea, a carbamide compound.
有這種修養，真是「其爭也君子」，只是從這裡也可看出一般人易犯的毛病。至於牌的質料，現在市面賣的，一副新台幣三百多元的麻將，大都是用尿素（含氮碳化物）製成。