Because it's an easy problem to put together.

因为这是一个很简单的问题。

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And it's not an easy problem.

这不是个容易解决的问题。

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Take methane. Its an easy problem to deal with.

以甲烷为例，对付它并不难。

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There may be some solution, but it's not going to be an easy problem to solve.

对于这个问题可能有解决办法但它并不是这么容易就能解决的。

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How to carry on valid and fast adjustment when difference appears between actual progress and former plan progress, to supervisory engineers, it is not an easy problem.

在对实际进度进行动态跟踪后发现实际进度与计划进度出现差异时如何进行有效而快速的调整，对监理工程师来说，这并不是一个容易的问题。

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How to carry on valid and fast adjustment when difference appears between actual progress and former plan progress, to supervisory engineers, it is not an easy problem.

在对实际进度进行动态跟踪后发现实际进度与计划进度出现差异时如何进行有效而快速的调整，对监理工程师来说，这并不是一个容易的问题。

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