应该能够看到单一屏幕的界面，其中结帐过程的每个步骤都在各自的选项卡内进行，而百叶窗式的视觉效果则标记了步骤间的转换。
You should see a single-screen interface in which each step of the process is carried out inside its own tab and a window-shade visual effect marks the transitions between steps.
选项卡为水平的文件夹比选项卡为垂直的文件夹效果更好，因为它们允许扩展更长的选项卡名。
Wide horizontal tabbed folders work better than narrow vertical ones because they allow for greater expansion of tab names.
传递给 tabs 方法的选项包使用了与 第 3 部分 相同的视觉效果，但额外的一个参数可用来禁用除第一个选项卡之外的所有选项卡。
The options bundle that you're passing to the tabs method employs the same visual effect you used in Part 3, but an additional parameter allows you to disable all but the first tab.
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