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”；

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”