这也恰恰是在实践中使用它们的原因：研究者多年以来已经明白将完全不治疗跟某种治疗法做比较往往会产生误导的结果。
That is precisely the point of using it in trials: researchers have known for years that comparing treatment against no treatment at all will give a misleading result.
目前已有研究试图把60-70年代的监测数据和现状的进行比较，以期找清原因。
Current research comparing chemical data taken in the 1960s and 1970s with the situation today may clarify things.
马萨诸塞剑桥Broad研究所正在对美国真菌的基因组进行测序，待测序完成后，将该基因组与欧洲真菌的相比较，试图查明美国真菌对蝙蝠如此致命的原因所在。
The genome of the suspect American fungus is currently being sequenced at the Broad Institute in Cambridge, Massachusetts.
伊瓦尼·鲁克说，“以前没有进行过这类研究，一部分原因是得到蜂鸟比较困难。”
"Part of the reason this type of work hasn't been done before is because of access to the birds," said Iwaniuk.
然而，有一个研究并未发现如此一种减弱，而且，一般而言，跨越研究的比较已经产生了困难，原因是不同的刺激物和任务赋予。
However, one study did not find such an impairment, and, in general, comparison across studies has been made difficult because of the different stimuli and tasks employed.
通过分析硫酸盐激发粉煤灰活性的水化反应过程和机理，比较研究硫酸盐对粉煤灰活性激发的差别及其原因。
Through analysis of the hydration process and mechanism of sulfate activating fly ash, this paper studies on comparison of the cause and the difference on activation effect.
为此本文把社会环境比较作为研究的起点，以便正确分析产生差异的原因，得出合理的结论。
In order to analyze the reasons of difference correctly and come to rational conclusions, we regard the research into the comparison of society environment as starting-point in the paper.
目标：这项回顾性研究比较了中国一家三甲医院过去20年(1993年1月1日- 2012年12月31日)糖尿病和非糖尿病患者的死亡原因。
Objective: Our present retrospective study compared the causes of death in diabetic and non-diabetic inpatients in a tertiary class hospital in the past 20 years (Jan 1 1993-dec 31 2012).
引起肾小管间质病变的原因比较复杂，其中蛋白尿的肾损伤作用已为大量临床和实验研究所证实。
The causes for tubulointerstitial changes remain rather complex and the role of proteinuria in damaging nephridial tissue has been demonstrated by large number of clinical and experimental studies.
这也是使得研究肥大细胞比较困难的一个原因。
This is one factor that has made the study of these cells so difficult.
其主要原因是由于这些酶具有高化学活性、结构复杂性、构象易变性等特点，使研究这些酶与稀土离子相互作用比较困难。
Because of the high chemical activity, the structural complexity and the conformational flexibility of enzymes, it is difficult to study of the interaction of rare earth ions with enzymes.
本文论述了测定液相传质系数的几种主要方法。通过比较它们的测定结果，研究了产生偏差的原因。
This paper introduced main determination methods of mass transfer coefficients. By comparing their determined results, the cause to produce error was analysed.
由于同义词的形成原因是多方面的，因此同义连用的语义构合关系就比较复杂，我们把它分为五类进行研究。
Because of diverse reasons for formation, the structures of semantic meanings are complicated after they are used together and can be divided into five types to research.
比较文学的危机根本原因在于它的无的放矢和空洞天物，要改变这种状况必须首先确立它的学科定位，并以重新关注人和人的命运激活它的研究活力。
The cause of crisis in comparative literature lies in its aimlessness and emptiness. It is necessary to establish its course orientation and to care about the human life to change the situation.
比较研究唐宋两代女性服饰，讨论其原因，触及的将是社会的本质和根源。
Compared with studies women's clothing of Tang and Song two Dynasties, discusses its reason, will touch will be society's essence and the root.
近年来通过对一些船舶失事原因的深入研究，发现在船舱进水导致船体沉没事故中，舱壁是比较关键的一环。
The recent study has found that in the case of ship sinkage, the bulkheads are vital structures in the situation.
根据土家语调查材料，运用比较研究方法分析了土家语交际功能变化的历时过程，剖析了引起土家语交际功能变化的原因。
Based on the survey materials about Tujia language, this paper makes an analysis of the diachronic changes of the languages communication function, and the reasons for these changes.
本类疾病的发病原因和病理机制比较复杂，目前有些机制仍不十分明了，部分研究缺乏针对性。
The pathological mechanisms of eczema are complicated, some are not very clear at present and some are in short of pertinence.
专家新手教师的认知比较研究显示，专家教师“专”的原因在于前者具有更丰富、更精致的图式，由此对教师教学效能的研究转向了教师知识的研究。
The comparative research on expert-novice teachers' cognitive process shows that expert teachers are better than novices because the former have more abundant and elaborated knowledge.
目的以1993-1999年武汉市儿童医院意外损伤住院病例为研究对象，对不同年龄、性别住院儿童的损伤类型和损伤原因进行分析比较。
Objective: To analyze the injury types and reasons of clinical cases from a Children Hospital between 1993-1999 by age and gender.
研究结果表明，本文所述的方法不仅可以提供比较准确的评定结果，而且有助于分析差异产生的原因。
The results shown that the methods will provide a reliable assessment and assist to find out the reasons of the performance difference.
本研究结果表明：产生学习倦怠的原因比较复杂，是多种因素综合作用的结果。
The research result suggested that the reason of producing the study burnout shall be complicated, mix with all sorts of factors.
到目前为止，国内对于使用公允价值会计进行利润操纵的研究还比较少，并且由于缺乏数据的原因大部分均停留在理论阶段。
Until now, there is few literature focus on the relationship between fair value and earning manipulation, for the reason of lack of data, most of which stays at the theoretical stage.
比较了研究公路瓶颈问题的两种常用方法———排队分析法和冲击波分析法，并解释了运用这两种方法可能得出不同结果的原因。
Two common methods in analyzing highway bottleneck problems — queuing analysis and shock wave analysis — are compared in this paper.
本文对《论语》的三个跨世纪的英译本进行了比较研究，目的不在于评价孰优孰劣，而在于探讨《论语》出现众多不同译本的原因。
Instead of evaluating the relative gains and losses in the three versions, the thesis only intends to probe the causes why there are so many translations of the Analects.
加紧对美国次债危机原因的分析，并结合我国的实际情况进行比较研究在当下具有非常强的现实意义。
To accelerate the analysis of debt crisis in the United States and combine with China's actual situation have a very strong practical significance.
亚洲人群屈光不正和青光眼的流行病学特征已经比较明确，但对糖尿病视网膜病变和年龄相关性黄斑变性等重要致盲原因的研究尚有欠缺。
While the epidemiology of refractive errors and glaucoma have been well characterized, there are few population-based knowledge on diabetic retinopathy and age related macular degeneration.
亚洲人群屈光不正和青光眼的流行病学特征已经比较明确，但对糖尿病视网膜病变和年龄相关性黄斑变性等重要致盲原因的研究尚有欠缺。
While the epidemiology of refractive errors and glaucoma have been well characterized, there are few population-based knowledge on diabetic retinopathy and age related macular degeneration.
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