棘手的

The frontogenesis process involves in the interactions among the systems of multiple scales. Since the hardness of the nonlinear problem, it is difficult to study frontogenesis analytically. The introduction of the effects of orography, friction and diabatic processes generally makes impossible the analytical resolution of the problem and leads to the use of numerical models. Primitive equations are numerical integrated together with a detailed description of physical processes. The circulation obtained is then used to diagnose and test theoretical mechanisms. It should be noted, however, that a fully description of frontogenesis in explicitly resolving the of large-, meso- and micro-scale flow in the same framework is not yet possible because of the excessive computer capacity and the time required. In order to deal with the problem, the action of large-scale background has been simplified and taken into consideration through the addition of the forcing into the nonhydrostatic cloud model.

大气锋生是一种多尺度相互作用的过程，理论研究遇到非线性的困难，在考虑地形、摩擦、非绝热等物理过程之后，解析研究更加棘手，通过数值模拟搞清其中的物理机制是重要的研究手段，但是把大、中、小尺度甚至微尺度的系统及其相互作用过程在一个模式里同时模拟好仍然受计算机速度和容量的限制，本论文在非静力云模式中通过强迫方式加入大尺度变形场的作用，在考虑到大尺度背景作用的同时，可以充分利用云模式所提供的丰富物理过程、非静力和高分辨率特点，开展一些过去较难进行的研究工作。

This proved far too optimistic for the post-Cold War world, and even in Central Europe, where liberal democracy did emerge, the dramatic events that brought it about were messier and chancier than the dreams of neo-conservative philosophers.

这证明了对后冷战世界的太过乐观，甚至在自由民主主义出现的欧洲中心区域，引发这一自由民主思想生成的给人以深刻印象的事件要比新保守主义的哲学家的梦想更加棘手难办、更为跌宕不安。

This text took the basic concept of supply chain interruption risk, the reasons and results of breaks off from the supply chain, and guard against to supply chain break off those several aspects to commence, through reading related books, and summary standpoints owned by the experts and the scholars than get such conclusion: The supply chain interruption risk is the problem that the very tough and can not be avoid to the supply chain and its business enterprise node.

本文从制造业中供应链管理实施的必要性以及困难、生产原材料产生中断的原因、生产企业选择供应商的标准方法，以及制造业供应链中断风险的防范等几方面入手，通过回顾2002年美国西海岸码头工人罢工事件，分析此次事件中遭受影响的制造企业，特别是日本丰田汽车公司应该采取的防范措施，得出这样的结论：制造业的供应链中断风险是制造商在管理和决策中十分棘手却又不可回避的问题。

In fact, in the real world, while the answers to the odd-numbered problems are not in the back of the textbook, the tests are all open book, and your success is inexorably determined by the lessons you glean from the free market.

事实上，在现实社会中棘手问题的答案从来不会出现在教科书的后面，所有的考验都是敞开的书本，你的成功将会取决于你在自由市场上悟到的教训。

Mr Obama will take office in January amid massive unrealisable expectations and facing a daunting list of problems - the wars in Iraq and Afghanistan, the broken healthcare system, the spiralling federal budget and America's profligate energy regime all prominent among them.

一月份，奥巴马先生将在各种难以实现的巨大期望中宣誓就职，他将面对一系列的棘手难题——伊拉克和阿富汗境内的战争，亟待健全的医疗体制，急剧上升的联邦预算及缺乏约束的能源制度是其中的主要挑战。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。