Leffingwell's observations of the problem, his advice on the solution, and his description of the resulting best practices come from experience: he's been there, done that, and has seen what's worked.
Leffingwell对问题的观察、他对解决方案的建议，以及他对结果的最佳实践的描述都来自于他的经验：他已经深入其中、完成了工作，并且看到了效果。
Leffingwell's observations of the problem, his advice on the solution, and his description of the resulting best practices come from experience: he's been there, done that, and has seen what's worked.
Leffingwell对问题的观察、他对解决方案的建议，以及他对结果的最佳实践的描述都来自于他的经验：他已经深入其中、完成了工作，并且看到了效果。
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