Clarity · Negative space, color, fonts, graphics, and interface elements subtly highlight important content and convey interactivity.
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Depth · Distinct visual layers and realistic motion convey hierarchy, impart vitality, and facilitate understanding. Touch and discoverability heighten delight and enable access to functionality and additional content without losing context. Transitions provide a sense of depth as you navigate through content.
Direct Manipulation · The direct manipulation of onscreen content engages people and facilitates understanding. Users experience direct manipulation when they rotate the device or use gestures to affect onscreen content. Through direct manipulation, they can see the immediate, visible results of their actions.
User Control · Throughout iOS, people—not apps—are in control. An app can suggest a course of action or warn about dangerous consequences, but it’s usually a mistake for the app to take over the decision-making. The best apps find the correct balance between enabling users and avoiding unwanted outcomes.
China's republican politics is like a child who just started schooling. He must have a good teacher and be surrounded by good friends. By the same token, the Chinese people, new to the republican politics, must be educated properly. The revolutionary government should be the people's tutor to impart advanced awareness and experience.