难以

But it will become increasingly difficult to maintain the closed political system in an ever more open economy and society.

但是，在一个经济和社会越来越开放的国家保持封闭的政治制度将越来越难以做到。

Well, most of you are too arrogant and closed-minded to understand.

好吧，那我告诉你，你们当中的大多数都是难以理解，思想封闭的傲慢鬼。

The authers examined the efficacy and safety of ASO,a new self_centering septal occluder consisting of two round disks made of Nitinol wire mesh and linked together by a short connecting waist.68 children with secundum ASD met with the criteria for transcatheter closure received this operation through the two_dimensional echocardiograp...

二十多年来相继研制出了多种经导管房间隔缺损封堵装置，但由于这些装置递送鞘大、操纵繁杂、难以回收及装置的支架断裂、易位和栓塞及术后较高的残余分流率等限制了它们的临床应用［1］。1997问世的Amplatzer房间隔封堵器，因其具自膨性、自

A stubborn problem for the designers of Bio2 was making rain for the cloud forest.

对生物圈二号的设计者们来说，一个难以解决的难题是为雾林造雨。

I had first known she was wrong, that her anxiety had clouded her judgment.

我知道她错了，她的紧张使她难以判断。

His body has disability, because of the poliomyelitis double lower limbs breaks down, the life provides for oneself hard; he ever by the envenom after maternal meal, but escape from death, abandon after again acrobatics of; his grind, run everywhere a make a living as a performer, also Ceng Jie head brushs a shoe to the person, but eventually because of body blemish everywhere be rebuffed; he and friend do poineering work together, the company inside half an year acquires asset 1.2 million, because the friend is set,cover however, in the choice in company and sweetheart, final a single cent or penny was not taken leave; cloudily he goes all out painstakingly in the network 9 years, final at 8 year end, take over 13GM game to stand integratedly Www.13gm.com , be in of the two amazingly quick inside week pull angel financing.

他身患残疾，因小儿麻痹症而双下肢瘫痪，生活难以自理；他曾被母亲饭后下毒，但大难不死，后又遭抛弃；他苦学杂技，四处跑场卖艺，也曾街头给人擦鞋，但终因身体缺陷四处碰壁；他与朋友一起创业，半年内公司获得资产120万，却因朋友设套，在公司与爱人中抉择，最终分文未取黯然离开；他在网络中苦拼九年，最终于08年末，接手13GM游戏综合站 www.13gm.com ，并在两周内神速的拉到天使融资。

But ECT technology has the following characteristics: 1 the measured capacitance and its change induced by the measured material concentration variation are very small, but the stray capacitances of co-axial screening cable and CMOS switches are relative very large, so the capacitance detecting is easily affected by the stray capacitances, 2 the electric fields in the sensors detecting region is affected by the permittivity distribution, non-uniformity of the space responsive sensitivity is very high, and the image reconstruction is undetermined.

但由于ECT技术中，首先所检测的微电容量及其因物流相含率的变化所引起的变化量很小，而由相关的连接同轴屏蔽电缆与切换CMOS开关所引入的杂散电容远远大于测量电容，微电容的测量容易受杂散电容等的影响；其次，多电极电容传感器测量区内的电场受介质分布的影响，且测量区内的空间响应灵敏度极不均衡，其影响图像重建的不确定性；其三，ECT中的图像重建，由于其是一个欠定问题的求解，在迭代求解方法中，迭代的初值影响迭代过程收敛到近似解的速度；其四，对于气/固两相流应用而言，由于ECT系统在线标定的难以实现，管壁磨损等因素的影响制约该技术应用于生产工艺中气/固两相流的长期连续检测。

When the sodium lauryl sulfate and p-octyl polyethylene glycol phenyl ether is used and its level in 3% and 6: 4 ratio, the polymerization process has the lowest coagulum and the highest monomer conversion. Higher reaction temperature and more level hydroxyl value lead to more coagulum, the latter also lead to larger particle size. The acid value has larger influence on viscosity and coagulum, there exist a best range. The emulsion particle size is larger for its hydrophilicity, most of its particles are connected together.

在含较高亲水单体的乳液聚合体系中，难以制得稳定的预乳化液，不能采用工业生产中常用的预乳化工艺，而只能采用混合单体直接滴加的方法；由于单体混合物的亲水亲油值较高，用阴离子型乳化剂十二烷基硫酸钠和非离子型乳化剂聚乙二醇辛基苯基醚混合，用量为单体总量的3％，且比例在6：4时，乳液聚合时具有最低的凝聚物含量和最高的单体转化率；乳液聚合反应温度升高，可以提高单体转化率，增加反应速度，但凝聚率相应提高；随着羟基单体含量的增加，聚合过程中凝聚率增加，聚合物乳胶粒平均直径增加；羧基单体有一个最佳的用量（2.6％），过高或过低凝聚率均提高；羧基含量对乳液的粘度有较大的影响，当羧基含量较低时，羧基含量增加，乳液粘度增加明显；含羟基乳液粒子由于含亲水基团较多，使得乳胶粒径增大，乳胶粒子大多数互相凝聚在一起，处于凝聚态。

Two Soft Acales Coccus pseudomanoliarum Kuw. and C. hesperidum L. are difficult to be controlled in some oversea areas where parasitic wasps are not occurred.

柑桔软蚧和褐软蚧两类蚧虫，在国外部分国家成为难以对付的害虫，主要是缺乏具有制约作用的寄生性天敌。

However, stop codon susceptibility to gentamicin between different genes is difficult to predict.

但是，不同基因的终止密码子对庆大霉素的易感性是难以预测的。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷