Quickly determine the scope of the next release by combining business priorities and technical estimates.
结合业务优先级与技术工作量评估，快速确定下一个迭代/发布的范围。
Put a simple system into production quickly, then release new versions on very short cycles.
快速将简单系统投入生产，随后以极短的周期持续发布新版本。
Guide all development with a simple shared story of how the whole system works.
用全团队通用的简单故事/比喻来引导整个系统的工作原理与架构视角。
Include a real, live user on the team, available full-time to answer questions.
让真实用户或业务代表全职驻留团队，实时解答疑问与验收功能。
The system should be designed as simply as possible at any given moment. Extra complexity is removed as soon as it is discovered.
任何时刻都保持最简设计（YAGNI/KISS），一旦发现多余的复杂度立即移除。
Programmers continually write unit tests, which must pass completely for development to continue.
持续编写自动化测试，所有测试必须完全通过才能继续后续开发（红-绿-重构）。
Programmers restructure the system without changing its behavior to remove duplication, simplify, or add flexibility.
在不改变外部行为的前提下调整代码结构，消除重复、提升清晰度与灵活性。
All production code is written with two programmers at one machine.
所有生产代码均由两位程序员在一台电脑上共同编写（Driver & Navigator）。
Anyone can change any code anywhere in the system at any time.
消除知识孤岛，团队中任何人可以在任何时间修改系统中的任意代码。
Integrate and build the system many times a day, every time a task is completed.
每完成一个任务就集成并构建系统，保持每天多次的高频集成。
Work no more than 40 hours a week as a rule. Never work a second week of overtime in a row.
保持可持续的开发节奏（Sustainable Pace），拒绝连续加班以维持高代码质量。
Programmers write all code in accordance with rules emphasizing communication through the code.
统一团队编码规范，强调通过代码本身传递清晰的意图与沟通。