In a class of Zhejiang University, nearly 200 students received a special meeting gift — a pair of 3D glasses for each person. Some students put on the glasses in pleasant surprise immediately, while some took photos and posted them on WeChat Moments to "show off how cool this is". In fact, these 3D glasses are just one of the more than 100 sets of teaching props for this course. There are also cat's eye rings, telescopes, polyprims, 3D cameras, high-speed cameras and so on. This makes many students who did not get to choose this course turn into "lemons" and express that they are so jealous.