敏捷给人留下刻板印象，这样说也不能说是完全错误的。
宣称已经实现了敏捷开发的团队经常这样说。
You hear this statement often from teams claiming to do agile development.
要计算这样的估算准确率，团队必须要耗费精力获得详细的“实际”工作小时数，我可从没有见过哪个敏捷实践倡议说要这样做。
To calculate this kind of estimate accuracy, teams would have to expend effort to capture detailed "actual" hours, a practice not advocated by any Agile approach I've seen.
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