长期存在的

Firstly, the establishment of model requires sophisticated neurointerventional techniques and costly interventional materials(sacculus, minikin circlip ring, endovascular electrocoagulation), it not only consumed time but also increased the resesrch expense ; Secondly, although the Massoud model is the first successful model that contain the nidus, but it is far from mimicking the high-flow fistulae frequently observed in a brain AVM; Thirdly, the rapid spontaneous thrombosis result in fistula occlusion in a short time;Fouthly, the model's natural course and the long–term patency of fistula are unclear;Currently the model is only used for the short-term research.

但Massoud模型目前存在以下主要缺点：第一，模型的建立需要复杂的神经介入技术和昂贵的介入材料(球囊、微弹簧圈、血管内电凝等)，操作费时，又大大增加了研究费用；第二，Massoud模型虽然首次具备了畸形血管团，但它远不是我们临床上常见的含有高流量动静脉瘘的脑AVM；第三，颈动静脉吻合口自发性血栓形成进而导致引流静脉闭塞的机率很高；第四，Massoud模型的长期自然过程和动静脉吻合口的长期通畅性尚不清楚，目前仅仅作为急性期模型。

"Thanks to strong and long-term partnerships with our established customers we can look back on a very successful business development in this country during the last 10 years of Flint Group's presence in Poland", comments Krzysztof Struszczak, Managing Director Flint Group Polska, on the announcement.

&由于到强，长期与我们既定的客户，我们可以回顾一下在过去的10富林特集团的存在多年的波兰在这个国家非常成功的业务发展&的长期合作伙伴关系，克日什托夫Struszczak意见，富林特集团董事总经理波兰，在宣布。

Furthermore, the experiences of artificial breeding and farming showed that different geographical populations of Meretrix clam are also substantially different in growth rate and the ratio of shell weight to soft-body one.

由于我国海岸线漫长、地形复杂，因长期地理隔离和生境不同，导致不同海域的文蛤在壳表形态和颜色、花纹图案等外观特征上均存在显著差异；另外，从多年的养殖实践中也发现，我国文蛤不同地理群体在生长速度、壳肉重比率等重要经济性状上也存在着显著差异，而这些性状的稳定性差异必然依赖于其分子遗传结构的变异。

The pooled regression analysisshows that there is a long-term prominent positive effect with time lag from China'sinward FDI to China's commodity imports and exports.

混合回归结果表明，外商对华直接投资对中国商品进出口、出口、进口的增长均存在长期且显著的促进作用，而且这种促进作用存在时滞。

The third is original labor market unclearing theory which was represented by Marx's relative surplus population theory.

这些理论以劳动市场出清论为基础，是对劳动市场出清论的一种延伸，它们或者能解析短期的总量性失业，或者能解析长期的结构性失业，但不能解析在劳动市场不存在障碍条件下的长期的总量性失业。

In serial passaging experiments, the genome of the chimeric pHBIV-2 could exist stably. The transcription was active and the activated proteins could be detected.

3在感染传代细胞中，嵌合克隆pHBIV-2基因片段可长期稳定地存在，转录始终处于活跃的状态；蛋白水平亦可检测到有功能性的蛋白；电镜结果也证实了培养上清中存在类似于HIV样的病毒颗粒。

There exists self-organization in the system of thoughtful and political education.In which of the past time,the by-organization but not self-organization is recognized,which snuffs out the activity of thoughtful and political education system and weakens its actual effect.

思想政治教育系统存在自组织方式，然而在过去长期的思想政治教育中，却存在重被组织方式而轻自组织方式的倾向，扼杀了思想政治教育系统的活力，削弱了思想政治教育的实效性。

Furthermore, singularity evaluating indicator and disunion test experiment are drawbacks also.

但是在长期地使用过程中存在着易发生早期破坏的缺点，另外在对水泥稳定碎石材料研究的过程中也存在着评价指标单一、试验方法不统一等问题。

Furthermore, singularity evaluating indicator and disunion test experiment are drawbacks also.

但是在长期地使用过程中也存在着容易发生早期破坏的缺点，另外在对水泥稳定砂砾材料研究的过程中也存在着评价指标单一、试验方法不统一等问题。

The conclusion is: There is a long-term equilibrium relationship between rural surplus labor force transfer and economic development ; In the long run, they have a positive correlation, and the former is the latter's onesided Granger causality ; And in the short run, the first-lag-phase economic variable, as well as the second one, the third one, the fourth one, and the second-lag-phase surplus labor force transfer variable, as well as the fifth one, they all give rise to economic short-term fluctuation.

其结论是：中国农村剩余劳动力转移与经济增长之间存在长期的均衡稳定关系；在长期，中国农村剩余劳动力转移与经济增长是正相关的，并且前者是后者的单向格兰杰成因；在短期，滞后一期、二期、三期和四期的经济总量以及滞后二期和五期的剩余劳动力转移总量均造成了经济的短期波动。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。