This is the window where you reload your meal card's balance (the window to the right is where you get new ones). Around 11:45 at the beginning of the second summer semester there's a huge line outside waiting for the first window. If you don't have a card yet, skip the line! And if you do and want to put money on your card, just have patience, the line moves pretty quick. In China, when you have to worry is when there isn't a line...because you'll end up waiting some other way (like say, the damn numbered tickets at the bank where you'll easily wait 20 minutes for simple transaction.)
EAP China! Robert Klein