引起因素

The bovine pericardial valves usually do not need anticoagulant therapy after implantation, but they are progessively failured in the heart and require reimplantation 5-10 years after their initial implantation.

引起牛心包瓣原发性损坏的生理学和病理学因素与机械学因素同等重要。从我院再次手术中收集到的22只失效瓣膜来看，在瓣架尖端区和侧边区的损坏发生率分别占30.3％和36％，撕裂、磨损和钙化的发生率分别占25.8％、18％和31.6％。

It is caused by Malassezia spp., which is the normal human saprophyte. Under certain conditions, both exogenous and endogenous, the fungus can convert from a yeast to a pathogenic mycelial form. Since the taxonomy of Malassezia spp. has recently been modified to include 7 species, there are several reports on the species from the PV scales, but the results are different.

在一定外源性和内源性因素下可引起花斑癣(Pityriasis Versicolor， PV)，新的分类方法将马拉色菌分为7个种以来，从PV患者分离到菌种构成的研究国内外均有报道，但结果很不一致，以往的研究方法多为培养法，受不同菌种的生长速度不同，以及存在菌种的覆盖和培养基选择性等因素的影响。

Academic motivation is the tendency to find school-related activation meaningful and worthwhile and therefore attempt to get the maximum benefit from them. It is the key factor of restricting academic behaviors and academic quality, and which forming and developing is influenced by a great deal of factors. Understanding the relationship between emotion, self-knowing and self-evaluation, social-culture factors and academic motivation may be central to developing more effective teaching strategies.

学习动机是指由学习需要引起的，激发、推动学生进行学习活动，并达到一定学习目标的内部心理倾向动力，是直接推动学生进行学习的内部动因，是制约学习行为和学习质量的关键因素，其形成和发展受多种因素的影响。

The results show that population change is the main cause for cultivated land reduction in Suzhou City since the reform and opening. In addition, changes of the urbanization rate and proportion of the tertiary-industry added value to regional GDP of the area also play an important role in the cultivated land reduction. In the scope of observational data, the relationship between the prosperous level and the cultivated land area is similar to the Environmental Kuznets Curve, and Suzhou City is at the early stage of the curve, that is, the period of prominent contradictions.

结果表明：在诸多影响因素中，人口数量的变化是引起改革开放以来苏州市耕地面积减少的主要因素；而第三产业增加值占地区生产总值比重和城市化率的变化对耕地面积的减少也发挥着重要作用；在观测数据范围内，富裕度和耕地面积之间存在类似环境Kuznets曲线，并且苏州市正处于该曲线的前期阶段，属于矛盾的凸显期。

This suggests that tunica intima function of vessel is the main factor to induce carotid atherosclerosis, but the level of serum cholesterol and triacylglycerol are the secondary factors.

说明引起颈动脉粥样硬化的主要因素是血管内膜功能，而血清胆固醇和三酰甘油水平是次要因素。

Automobile vibration has something to do with many factors, but road unevenness is the main one.

汽车振动与诸多因素有关，但路面不平度是最主要的因素，本文模拟分析了由路面不平度引起的汽车振动。

This paper summarized factors, both in biologic and abiological aspects that affected successful colonization and activity of bacterial inoculation. The impacts of inoculated bacteria on population structure of specific rhizobacterial communities and environment should also be paid an eye on.

本文主要针对国内外在影响微生物根际定殖的因素以及影响引入微生物活性的因素两方面的研究进行综述，同时强调对接种剂引入所引起的生物种群及生态环境变化应予以重视。

In recent years, with the development of finance globalization and the advance of the financial reforms in our country, the financial major and important cases caused by "human" factor have happened frequently at home and abroad, forming biggish financial risks.

孙强摘要：近年来，随着金融全球化的发展以及我国金融改革的推进，国内外金融界由于&人&的因素造成的大案要案频频爆发，引起了较大的金融风险，&人&的因素已日益成为金融监管研究的重要课题。

Objective To explore the change of serum estradiol (E2) and testosterone concentrations throughout the puberty of girls and estimate the effects of genetic and environmental factors on serum E2 and T concentrations.Methods study population consisted of 180 pairs of twin girls aged 6 to 18 of whom.132 pairs monozygotic twins and 48 pairs dizygotic twins,who were all from Qingdao city of Shandong province.

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In these prevalent areas of HBV infection and risky regions of HCC,HCV has not become the main and sole etiogenic,neither is it a rare phenomenon.

HCV感染虽非HCC的主要发病因素，HCV引起肝细胞损伤，增加肝细胞对HBV 及其它致癌因素如黄曲霉毒素的敏感性，加快肝癌发生进程。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。