站立书桌让课堂更加活泼有趣。DON’T like to sit in classrooms and study all day? Try a standing desk! Standing desks are popular in some US schools. Students get to stand and move (移动) more. The desk has wheels (轮子), so it moves easily. Students can also make it different heights (高度). They sit on the floor or on chairs to rest. They may bring a little fun into the classroom. Do you want to try it out? 21ST