These devices have neither feedback pipes to control the main jet nor wall attachmenteffect of the jet on them.
这些装置没有反馈管来控制主喷流，也没有射流的附壁效应。它们的结构很简单可以自激振荡。
2
"The Ikea effect" is when people buy and then construct products themselves, they develop an attachment or sense of pride to this object.
“宜家效应”指人们自己购买并动手制作产品时，会产生对该产品的依恋感或自豪感。
3
When the emotions are also evoked, more power, energy and attachment are added. This has an adverse effect on the behavior, judgment and general performance.