teetertotter
1. Two people balance on a teetertotter more commonly than just one (in the middle of the board), and sometimes two may swing together with one seated and the other standing and "pumping";
两个人坐跷跷板比一个人玩更普遍(一个人坐在翘翘板中间),有时两个人一起玩时,一头坐,另一头站,“上下摆动”;