It is undeniable that design is perceptual and humanized in many people's eyes. Emotional design plays a very important role in it. But at the same time, design, like mathematics, physics and chemistry, is an expression of the objective laws of nature. The beauty of mathematics lies in the understanding of the world through human efforts and mathematical formulas. The beauty of design lies in the process of discovering beauty and expressing it through words and graphics.

　　数学有定理和公式，设计有理论和模型。两者都是快捷方式。设计理论真的有用吗?

　　Mathematics has theorems and formulas, design theory and model. Both are shortcuts. Is design theory really useful?

　　从未知的点A到特定的点B的过渡——或者从可能性到确定性——对于设计师来说是一个闭环。

　　The transition from unknown point A to specific point B -- or from possibility to certainty -- is a closed loop for designers.

　　双钻石理论在直观的线性工作流程图中，用钻石为我们的形象展示了从无到有，从简单到复杂，后从复杂到简单的工作内容。

　　In the intuitive linear workflow diagram, the double diamond theory uses diamonds to show our image from scratch, from simple to complex, and finally from complex to simple work content.

　　我认为“设计对的东西”和“设计对的东西”非常适合设计师的工作。

　　I think "the right thing to design" and "the right thing to design" are very suitable for the designer's work.

　　前者是准备的过程，后者是行动的过程。准备是一切设计的开始。只有通过调查，发散，整合所有的研究目标，集中和简洁，我们才能确切的知道我们想要设计什么。只有了解这一点，我们才能“设计正确的东西”。

　　The former is the process of preparation, the latter is the process of action. Preparedness is the beginning of all design. Only through investigation, divergence, integration of all research objectives, concentration and conciseness, can we know exactly what we want to design. Only by understanding this can we "design the right thing".

　　“正确的设计”也是如此。主题确定后，设计师使用色彩工具、文本工具和排版工具来展示不同形式的设计风格。经过自迭代、内部迭代和迭代，终找到合适的答案。

　　The same is true of "correct design". After the theme is determined, designers use color tools, text tools and typesetting tools to show different forms of design styles. After self-iteration, internal iteration and iteration, the most appropriate answer is finally found.

　　除了本文介绍的双钻石理论外，还有许多不同的理论和模型，如KANO提出的KANO模型，如上世纪初起源于德国的包豪斯概念。这些理论和美学运动都在试图为设计寻找一条通向美的捷径。

　　In addition to the double diamond theory introduced in this paper, there are many different theories and models, such as the KANO model proposed by KANO, such as the Bauhaus concept originated in Germany at the beginning of last century. These theories and aesthetic movements are trying to find a shortcut to beauty for design.

　　物理止于数学，设计止于数学，数学止于哲学。设计理论是我们研究设计的方法，它帮助我们减少思考焦虑和过程控制。在知识储备日益丰富的今天，个体劳动分工越来越清晰。每个人都可以成为设计师。然而，通过设计理论，专业设计师在把握潮流和审美发展方面有着自己独特的地位。

　　Physics ends in mathematics, design in mathematics, and mathematics in philosophy. Design theory is the way we study design. It helps us to reduce thinking anxiety and process control. Nowadays, the knowledge reserve is becoming more and more abundant, and the division of individual labor is becoming clearer and clearer. Everyone can be a designer. However, through the design theory, professional designers have their own unique position in grasping the trend and aesthetic development.