点击主按键后，一个小的卡式窗口中就会显示当前正在运行的程序，这时就可以随意地向左或向右选择卡片，也就是选择程序。
Hit the physical home button, and each app currently running is displayed in a small Card window. Swipe left or right to switch between the Cards.
控制卡可以指出程序是在主系统带上还是其他卡片上。
The control card may indicate that the program is on the master system tape or on CARDS.
页面可以立即从主通知卡片的右边划出，它们一般用来添加附加的细节或主内容的次级视图。
Pages appear immediately to the right of the main notification card. They are typically used to provide additional details or alternate views of the main card's content.
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