To create a new buttonface, you must first remove one.
要创建新的按钮图面，必须先删除一个。
2
The child had to push a button as soon as he saw the face.
试验要求每个孩子看到一幅人脸图像就立即按下一个按钮。
3
My great aunt answers her house phone every time, not by pressing the talk button, but by pressing the speaker phone button, yet still holding it up to her face as if she answered it normally.