Based on scenarios, determine which controls and bits of data users need to understand instantly, which are secondary, and which are needed only by exception.

• 按照场景剧本来分析和决定哪些控件和数据需要立即被理解和访问、哪些次之，哪些是偶尔才需要被理解和访问，我们这样进行分层也就相应地创建出了视觉层次。