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To create a new button face, you must first remove one.
要创建新的按钮图面，必须先删除一个。
youdao
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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。
youdao
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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。
youdao