Therefore, It is very difficult that the accurate description of this problem and the response of the collision problem.

因此，对该问题及其响应进行准确描述难度很大。

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The hydrogeologic condition of Danhou mine is complex, and the sublevel coal is threatened by O. L. water. It is very difficult that thin confining bed coal is mined under pressure.

单侯矿井水文地质条件比较复杂，下部煤层受奥灰水威胁，薄隔水层带压开采问题非常突出。

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It is universally acknowledged that it's very difficult to shake off bad habits.

众所周知，摆脱不良习惯是非常困难的。

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It is very difficult to think that this is a positive move.

BBC: UK citizenship test 'to cover Britain's greats'

But given the tax-related ideas floating in Congress, it is very difficult to imagine that such a scenario would include broadly dangerous, anti-growth tax increases.

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The Near Earth Object (NEO) database is working to do that, but it is very difficult to locate all of the objects either closer to the sun or behind it.

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