首先，我们将完全修改主页 HTML，保持总体外观不变，但使该页面与浏览器更兼容。
First, we'll totally rework the main page HTML, keeping the same overall look, but making the page more browser-compatible.
单元测试工具使我们能够检查重整情况下继续保持的程序的关键不变量。
Unit testing tools allow us to check that key invariants of our programs continue to hold under refactoring.
这个松耦合使会话一端的软件可以在不影响另一端的情况下发生改变，前提是消息模式保持不变。
This loose coupling allows software on each side of the conversation to change without impacting the other, provided that the message schema stays the same.
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