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”;
The results indicate that: siphon effect mainly supplies the matter and energy transformations, connected vessels effect is to start vertical movement 、 excitated gravity wave probably and produce phenomena of teetertotter, while narrow pipe effect is to increase velocity. 结果表明,河西走廊连通器的虹吸效应主要是传输各种物质和能量,连通器效应是产生垂直运动、激发重力波和产生翘翘板现象,而狭管效应主要是增强风速。