难以

A finite element model is proposed to calculate the mechanical state of a moored aerostat system. The difficulty in matching the loads of the tethers is overcome by releasing the tether constraints and applying the load step by step. The causes of non-convergence during computation is investigated and solved by modifying the criterion appropriately.

针对浮空器地面系留系统采用多级系绳集束设计导致有限元建模中系留力难以施加的问题，提出了分步加载，对系绳节点逐级建立载荷匹配关系的建模技术；对囊体局部应力集中导致计算难以收敛的问题进行了分析并提出解决方法。

Alunite auto-flow grouting materials without shrinkage ;2nd grouting layer of equipment foundation ; Application

本文认为在普通灌浆料难以施工、难以保证工程质量的一次浇灌层上，明矾石无收缩自流灌浆具有广泛的使用价值

Because the numerical simulation method neglects the dynamical change of penetrability and stress field during metallogenic process, it is devoid of the similitude to the reality and failed to deal with the problem too. Although the analogue experiment can simulate the transportation process of polyphase fluid in the 2D dynamical structural frame, it cant carry out the 3D experiment because of the limitation of the experimental conditions.

而定量模拟难以把握成矿期介质渗透率及成矿应力场的动态变化，使其与实际地质对象在物理性质上具有一定差距物理实验虽能处理二维动态构造形变场中流体输运问题，但由于实验条件的限制，难以处理三维空间内流体运移问题。

Analphabetic farmer quality is inferior, ignorant, information is ineffective, learn hard and technology technology, accept strange thing hard.

文盲农民素质较低，孤陋寡闻，信息不灵，难以学习和应用科学技术，难以接受新鲜事物。

Quantum theory generalizes classical mechanics to provide accurate descriptions for many previously unexplained phenomena such as black body radiation and stable electron orbits .

有人引用量子力学中的随机性支持自由意志说，但是第一，这种微观尺度上的随机性和通常意义下的宏观的自由意志之间仍然有着难以逾越的距离；第二，这种随机性是否不可约简还难以证明，因为人们在微观尺度上的观察能力仍然有限。

Cerium oxide has a wide range of uses, but many applications require special physics properties of particles. It is particle morphology, size, structure, dispersion, surface properties ,this physical and chemical properties, that determine their application field, but the traditional preparation process is difficult to control cerium oxide particle morphology and physical properties, thus making it difficult to meet the application requirements.

氧化铈有着广泛的用途，但很多方面的应用都要求其粒子具有特殊的物性，粒子的形貌、尺寸、结构、分散性、表面性能等物化性能决定其应用领域，但传统制备工艺难以控制氧化铈粒子的形貌及物性，从而难以满足应用的需求。

This approach not only inherits the advantages of absolute density based algorithms which can discover arbitrary shape clusters and are insensitive to noises , but also efficiently solves the following common problems: clustering results are very sensitive to the user-deflned parameters, reasonable parameters are hard to be determined, and high density clusters are contained fully in coterminous low density clusters. With this approach, incremental clustering can also be supported effectively by defining the affected sets and seed sets of the updating objects in this approach.

聚类算法的有效性问题主要表现在三个方面：其一，聚类算法大多要求用户输入一定的参数，例如希望产生的簇的数目，而这些参数通常难以确定，特别是针对高维空间中稀疏分布的实际应用数据集，用户几乎无法给出合适的算法参数，因此非专业用户需要与数据分析专家密切配合才能保证获得理想的聚类结果，导致算法的使用极为不便；其二，聚类结果对于输入的参数值过于敏感J，往往参数值的一些轻微变化却产生聚类结果的很大差异；其三，对于高维的实际应用数据集，其数据分布往往是稀疏的、杂乱的，很难为算法选择全局的参数进行准确的聚类分析，使得聚类的质量难以保证。

If the latter possess native sagacity, and a nameless something more- let us call it intuition; if he show no intrusive egotism, nor disagreeably prominent characteristics of his own; if he have the power, which must be born with him, to bring his mind into such affinity with his patient's, that this last shall unawares have spoken what he imagines himself only to have thought; if such revelations be received without tumult, and acknowledged not so often by an uttered sympathy as by silence, an inarticulate breath, and here and there a word, to indicate that all is understood; if to these qualifications of a confidant be joined the advantages afforded by his recognised character as a physician- then, at some inevitable moment, will the soul of the sufferer be dissolved, and flow forth in a dark, but transparent stream, bringing all its mysteries into the daylight.

假如那医生有天生的洞察力，还有难以名状的某种能力——我们姑且称之为直觉吧，假如他没有流露出颐指气使的唯我独尊，他自己又没有鲜明的难以相处的个性，假如他生来就有一种与病人脉脉相通鲍能力，借此使病人丧失警觉，以致自言自语地说出心中所想的事，假如他平静地听到这些表白，只是偶尔用沉默无声的同情，用自然而然的喘息，以及间或的一两个字眼，表示充分的理解，假如在一个可信赖的人的这些品格上加上他那医生身分所提供的有利条件——那么，在某些难以避免的时刻，患者的灵魂便会融解，在一个黑暗而透明的小溪中涓涓向前，把全部隐私带到光天化日之下。

The system of RCC and the economic development is discrepant in developed cities.

农村信用社在现行体制的束缚下，自身难以得到充分的发展，为农村经济服务也难以得到充分的发挥。

In the earsplitting clamor over the energy crisis that has since followed, so many plans,proposals, arguments, and counterarguments have been hurled at us that it is difficult to makesensible choices.A

各种计划、建议、争论和意见，纷纷向我们袭来，令人难以做出清醒选择。A2：从此，能源危机呼声，甚嚣尘上，震耳欲聋，各种计划、建议、争论和意见，纷纷向我们袭来，使人难以作出合理选择。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。