【Content】We challenged ourselves to create a visual language for our users that synthesizes the classic principles of good design with the innovation and possibility of technology and science. This is material design. This spec（规格） is a living document that will be updated as we continue to develop the tenets and specifics of material design.
我们尝试挑战自己去创建一种针对我们自己用户的视觉语言，能够将技术与科学产生的可能性及创新构建成一个优良的经典设计标准。这就是质感设计。设计规格的文档是灵活的，我们会持续地构建充实质感设计的原则和细节。
【Goals】Create a visual language that synthesizes classic principles of good design with the innovation and possibility of technology and science.
创造一种根据创新和科技技术产生的可能性而产生的一种新的视觉语言。
Develop a single underlying system that allows for a unified experience across platforms and device sizes. Mobile precepts are fundamental, but touch, voice, mouse, and keyboard are all first-class input methods.
创建一个在不同平台和设备型号上都有统一体验独立的底层系统，在遵循基本的移动规范上，将触摸、声音、鼠标、键盘都看做第一类输入方式。
【Principles】
Material is the metaphor
A material metaphor is the unifying theory of a rationalized space and a system of motion. The material is grounded in tactile reality, inspired by the study of paper and ink, yet technologically advanced and open to imagination and magic.
Surfaces and edges of the material provide visual cues that are grounded in reality. The use of familiar tactile attributes helps users quickly understand affordances. Yet the flexibility of the material creates new affordances that supercede those in the physical world, without breaking the rules of physics.
The fundamentals of light, surface, and movement are key to conveying how objects move, interact, and exist in space and in relation to each other. Realistic lighting shows seams, divides space, and indicates moving parts.
质感隐喻是一种针对合理空间和系统动画的统一理论。质感设计以触摸现实为基础，灵感来自纸张和油墨的研究，以及先进技术、开放的想象力。
