添加图片注释，不超过 140 字（可选）
sys.stdout.flush()
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An entirely new, powerful, and intuitive windowing system helps users control, organize, and switch between apps, all while maintaining the simplicity of iPad. And with a new menu bar, users can access the commands available in an app with a simple swipe down from the top of the display, or by moving their cursor to the top.
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