A data - bound control field that encapsulates general button functionality 封装常规按钮功能的数据绑定控件字段。
2.
The a button is used to perform an action of some form ; we presume this is a general button for speaking with people or entering buildings 按键a用于做某种形式的动作；我们认为这是一个普通按钮，用于和人们说话或者进入建筑物。
