u-button-danger 红色按钮
If you witness some threat or if the child feels some danger in any situation, he can press the SOS button.
如果你看到某种威胁，或者孩子在任何情况下感到危险，他可以按下紧急求助按钮。
The color of the button implicitly suggested the consequence of clicking it, especially the red button, which suggested "danger" if the user clicked it but didn't mean to close the window.
“按钮的颜色无形中暗示了点击产生的结果，尤其是红色的按钮暗示着”危险“，如果用户点击了它却又不打算关闭窗口的话。”
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