Stability control of expansive soil slope is one difficult problem of engineering construction.

膨胀土边坡稳定性控制是工程建设的一大难题。

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With the further exploration of Tuha basin, one difficult problem is logging interpretation and reservoir evaluation for low porosity and low permeability reservoir.

随着吐哈盆地勘探的进一步深入，低孔、低渗储层是测井解释和储层评价的一个难题。

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One difficult problem we face as small businesses is that we're doing everything and sometimes we're too close to our work to notice things that could be causing problems.

作为小型企业，我们面临的一个难题是我们事事俱备，但有时我们可能会“当局者迷”，意识不到可能导致问题的一些方面。

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In many ways for Aristotle as it is for every student of politics the most serious the most difficult issue one confronts is the problem of faction.

从很多方面看来，无论是对亚里士多德,还是每位政治系的同学而言,最令人最感严肃,与严重的问题,是派系的问题。

耶鲁公开课 - 政治哲学导论课程节选

Each one of these is a difficult problem to unwind, and many of us struggle with more than one.

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One problem was that it is extremely difficult to recreate the effect in the laboratory.

ECONOMIST: Recreating the planet's magnetic field in a laboratory

But, to judge from Mr Sabbagh's book, most mathematicians would incline more towards Hilbert's view that a solution will one day be found for even the most difficult mathematical problem.

ECONOMIST: Mathematics