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。
discover the context they need.
。新收录的资料是该领域的重要参考
vals := [10, 20, 30];
The fratty Hegseth first appeared doing a "hegstand" with "Sprite" (wink wink) before combatively engaging with the media. "We're treating Iran like the breathalyzer in my car and blowing it the hell up," said Jost's Hegseth. He denies that what's happening is a war, instead calling it a "situationship," and makes a "your mom" joke rather than answering whether they'll actually have boots on the ground.