A placebo¹ button is a push-button with apparent functionality that actually has no effect when pressed. Such buttons can be psychologically rewarding to pressers by giving an illusion of control. 

安慰按钮指的是表面上看具备某种功能，但实际按下去却没有效果的按钮。这类按钮能给使用者带来心理上的收获，让人产生控制感。

 

They are commonly placed in situations where it would have once been useful to have such a button but the system now proceeds automatically. 

安慰按钮常出现在过去有用，但后来系统实现了自动化的地方。

 

In some cases the button may have been functional², but may have failed or been disabled during installation or maintenance or was, in a relatively³ small number of cases, installed to keep people contented⁴, much in the same way as placebos⁵. 

在一些例子中，这个按钮可能一直在使用中，但可能已经失效，或在安装维修中失去了功能；在少数例子中，安装这种按钮是为了让人们满意，类似于安慰剂。