业务层应该对业务对象进行操作，而不是对与视图相关的特定数据表示进行操作。
The business layer should operate on business objects — not on a particular data representation tied to the view.
虽然这些图标在桌面上不是可单击的链接，但是屏幕阅读器可以朗读出与视图中每个图标相关的号码。
While these are not clickable links on the desktop, the screen reader does speak the Numbers associated with each icon in the view.
View Controller：这是与hold视图相关的View controller类。
View Controller: This is the view Controller class related to the hold view.
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