iOS 6、Windows Phone 8 以及 Android 4.1，图片来自 TechRadar三段式导航是最典型的例子。Windows Phone 底部永远只有三个按键：返回、开始、搜索。这种逻辑带来一种确定性，即无论你深入多少层级，按返回键都能一步步退回之前的应用页面和操作原点，而不是像 Android 那样最终被直接抛回桌面。
«Они сами заварили эту кашу». Китай начал давить на Иран из-за конфликта с США. Что требует Пекин от партнера?19:31
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closing_event = asyncio.Event()，详情可参考体育直播
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