你也许注意到了，在上面的 XAML 中我们的顶层控件设置成了固定的高度和宽度
One thing you might have noticed in the XAML above is that our top-level control is currently set to be a fixed width and height
若你最近逛过鞋履部，你也许已经注意到高跟鞋的高度正在成长-不仅仅是在普及方面。
If you've browsed a shoe department lately, you may have noticed that high heels are growing-and not just in popularity.
我这儿不是说什么高度警惕，不过是要注意你的周围。
I'm not talking about hyper-vigilance here. Just pay attention to what is around you.
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