The shear strength parameters of rock masses are generally most important and difficult to determine when performing stability analysis of rock works.

岩体抗剪强度参数的确定是进行岩体工程稳定性分析中最基本和最重要的，也是最困难的一项工作。

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The mutual effects of the structure, initial anisotropy and complex stress path make it complicated and difficult to determine the progressive destructive strength and parameters of natural soils.

由于结构性、初始各向异性和复杂的应力路径的共同影响，往往使极限状态设计如何确定天然土体渐进破损的强度及参数变得复杂而困难。

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Outsiders may then find it difficult to determine your contributions and strengths.

局外人可能会很难确定你的贡献和优势。

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and NATO forces even as the Obama administration prepares to send an additional The hazy groups and alliances of what collectively comprise the Taliban make it difficult to determine just who the U.S.

VOA: standard.2009.03.11

"In my judgement an informed and fair-minded observer would recognise that the intention of Parliament was that we should equip ourselves where possible with sufficient expertise to deal with the very difficult and very important questions we have to determine, " said the judge.

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"It can be very difficult to determine when and where the initial entry point was, " he said, adding that without firm information about that, throwing out the old hardware might be a reasonable choice.

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His fellow Sheffield Brightside MP and former Home Secretary David Blunkett said it was difficult to determine who, outside of the family, could have been expected to take steps to intervene.

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