And a standingwave means there is a geometric constraint which is what?
驻波意味着有几何限制，几何限制又是什么？
2
Their mutual self-supporting pose is continuously almost-falling, like a standingwave in a spring creek.
相互自我支持的姿态就是不断的放低自己，就像春天溪流中的驻波。
3
According to Peter Handel of the University of Missourithat can, in the right circumstances, create a standingwave of electromagneticenergy which makes the surrounding air glow.