An important thing to note here is that you should either design and write new code, or refactor existing code.
这里要注意的重要一点是，您应该要么设计并编写新代码，要么重构现有的代码。
Tools can recognize errors and effectively restructure, or refactor, code.
工具可以识别错误和有效地重构代码。
They refactor code to make it more testable.
他们重构代码，让代码更加易于测试。
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