Underestimating the complexity of a problem.

对问题的复杂性估计不足。

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Few would argue that the enormous complexity of the gargantuan US Federal Government is a huge and dangerously expensive problem.

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One way to cut through the complexity is to look at a relatively small and tractable subset of the larger problem.

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They are concerned about the cost and the complexity of the system, and they should be concerned because that is still going to be a problem.

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