Difficult, because the student's meal card is bound to the student card, it is impossible for someone to give it to you. Those prepaid cards that can be bought with money can only get 80, 85 (after deducting the national student catering allowance), which needs further study or employees to do. There are all kinds of troubles every semester, and those places where cash can be used are more expensive, except Qingyonghe (ten thousand people) on the first floor of the official reward garden. Therefore, if you often go to Tsinghua's canteen to eat, the most practical way is to always bring your own change (a piece of 5 yuan plus a few dollars) and let your classmates type it for you. You don't usually refuse to give them cash.