The details of the principal cause are not known.
主因未详。
The climate is changing, the effects are already being felt, and human activities are a principal cause.
气候正在变化，已能感觉到其影响，而人类活动是一个主要原因。
Apart from relapse of a person's disease, GVHD is the principal cause of death in patients who have received donated bone marrow.
除了患者病情复发，移植物抗宿主病是接受骨髓细胞移植病人死亡的主要原因。
While the pervasive noise about an impending us recession has not helped sentiment, the principal cause of concern has been fear of an oversupply of new shares.
尽管关于美国经济即将陷入衰退的广泛传言影响了市场人气，但人们的主要担心，还是害怕新股供应过量。
The principal cause is unemployment, which has risen past 10%, as well as increasing Numbers of people who have had their hours cut back or been forced in to minimum wage jobs.
这主要是由于失业率已上升到超过10%，以及越来越多的人工作时间被削减或被迫从事只拿最低工资的工作。
Other supporters of the prime minister are calling for Mr Fini, the principal cause of Mr Berlusconi’s weakening grip on office, to resign as speaker of the lower house.
贝卢斯科尼大权日益削弱的主要原因就是Fini。 因此，首相的其他支持者要求Fini下课，退居下议院作发言人，但并没有出言不逊。
The United States has been the major producer of greenhouse gases for most of the last hundred years and thus a principal cause of the adverse changes that are altering the global environment.
过去一个世纪的绝大多数时间里，美国已经成为温室气体最主要的产生者，因此应该对全球气候的不利改变担负主要责任。
Drinking is the principal cause of this traffic accident.
酗酒是这起交通事故的主要原因。
Burning fossil fuels is the principal cause of climate change, which increasingly threatens prosperity and stability in all regions.
燃烧化石燃料是造成气候变化的主要原因，它日益威胁着世界各个地区的繁荣和稳定。
The invasion and spread of cancer cells to other parts of the body, known as metastasis, is a principal cause of death in patients diagnosed with breast cancer.
在诊断为乳腺癌的病人中，癌细胞侵袭与扩散至身体的其他部位（即转移）是导致病人死亡的主要原因。
Drinking is a principal cause of traffic accidents.
酗酒是交通事故的主要原因。
The moon, being much nearer to the earth than the sun, is the principal cause of the tides.
月亮比太阳距离地球更近，是引发潮汐的主要原因。
Drinking is a principal cause of highway deaths.
酗酒是公路死亡事故的最重要的原因。
These results show that the physiological cause of the core Browning is due to the enzymic Browning reaction and the principal substate in the core is chlorogenic acid.
根据以上实验结果，我们认为多酚类化合物的酶促褐变是造成鸭梨黑心病的生理原因，绿原酸可能是主要的产物。
But the principal, underlying cause was that, as early as the beginning of the twentieth century, human equality had become technically possible.
但是主要的、根本的原因是，早在二十世纪初期，人类平等在技术上已可以做到了。
The setpoint control of the Ievel is one of the principal factors that cause the flow oscillation.
液位的定值控制是造成物流频繁变化的主要因素之一。
The principal cause of lightning stroke failures occurred in UHV transmission lines is the shielding failure, so it is suggested to adopt the negative protecting Angle for UHVDC transmission lines.
引起特高压输电线路雷击故障的主要因素是雷电绕击，建议特高压输电线路采用负保护角运行。
Frequent consumption of sugary snacks is the principal cause of tooth decay, which can cause a GREat deal of pain and discomfort.
频繁摄取含糖的零食是蛀牙形成的主要诱因，给人们带来了很大的痛苦和不便。
The poets awakening of his natural inherent quality and principal consciousness is the root cause of the formation of landscape poetry.
诗人自然本性和主体意识的觉醒是山水诗形成的根本原因。
The policy burden not only bring soft budget constraint to affect the principal′s utility function, but also cause the problem of asymmetric information that induces managers to seek gray income .
由于政策性负担不仅产生了软预算约束问题，影响委托人的效用函数，而且加深了信息不对称程度，导致经营者追求灰色收入。
Laziness is not a principal cause of poverty.
懒惰不是贫穷的主要起因。
What may be cause of principal of travels.
什么是引起旅行的主要因素。
The results show that the irrationality for structural design and manufacturing process is principal cause for bottom corrosion.
结果表明：结构设计和制造工艺不够合理是YSP-15型钢瓶底部严重腐蚀的主要原因。
It is well known that atherosclerosis (AS) is the principal cause of death in the world and hyperlipidemia is the major risk factor for AS.
动脉粥样硬化(as)是目前人类主要的死亡原因，高血脂是一种重要的致病因素。
Social structural tensions and flawed State systems are the principal cause of this massive occurrence of transgress, which in return constraints the operation of social control.
这是因为社会的结构性紧张以及一些存在缺陷的国家制度导致了拐卖妇女这一大规模越轨行为的发生，并制约着社会控制的运作。
The principal leaders of those who assemble a crowd to seriously disrupt order in military administrative zones, hamper operation in the military administrative zones and cause serious losses.
聚众扰乱军事管理区秩序，情节严重，致使军事管理区工作无法进行，造成严重损失的，对首要分子。
Chapter 3: This chapter explains the cause that the indirect speech act brings up, politesse is the principal reason.
第三章：这一章主要阐述了间接言语行为产生的原因，礼貌是其产生的首要动因。
The change of time-space flow structure is the principal cause of the performance improvement.
计算结果揭示了在激励流动下流场的时空结构的变化是流场性能得到提升的根本原因。
The change of time-space flow structure is the principal cause of the performance improvement.
计算结果揭示了在激励流动下流场的时空结构的变化是流场性能得到提升的根本原因。
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