For reasons not fully understood, the field itself reverses periodically every million years or so.
由于一些尚不完全清楚的原因，该领域本身大约每隔百万年就会周期性地翻转一次。
What is still not fully understood, however, is why some trees resort to producing red pigments while others don't bother, and simply reveal their orange or yellow hues.
然而，至今仍不完全清楚，为什么有些树木倾向于制造红色素，而有些树木不去刻意制造色素，但还是会呈现出橙色或黄色。
The environmental changes associated with this transition are not fully understood, but people living closest to the San Juan Mountains, to the northeast of Mesa Verde, were affected first.
与这一变迁相关的环境变化并未得到人们的充分认识，但是离位于梅萨维德东北部的圣胡安山脉最近的居民却首先受到了影响。
The exact causes of PMS are not fully understood.
经前综合症的确切病因尚未完全了解。
The cause of stomach cancer is still not fully understood.
事业的胃癌是还没有完全理解。
However, the mechanism for such a trend is not fully understood.
然而，这一趋势的机制目前仍未完全清楚。
The increased risks were relatively small and are not fully understood.
服用激素所增加的风险很小，而且还没有完全弄明白其机理。
Though a major risk factor is obesity, the exact cause is not fully understood.
尽管打鼾的主要原因是肥胖，具体成因却一直没有被完全知晓。
China's stimulus package plan was not fully understood by the world, he said.
中国的刺激方案计划不完全地被世界理解，他说。
Objective The pathogenesis of essential hypertension (EH) is not fully understood as yet.
目的原发性高血压（EH）的发病机制迄今仍未完全清楚。
In particular, the role of inflammation in plaque destabilization is not fully understood.
特别是，在（粥样硬化）斑块不稳定中炎症（所起）的作用还没有完全掌握清楚。
In these cells it is protected from the drugs by mechanisms that are, as yet, not fully understood.
在这些细胞里，它们被一种尚未被人类完全认识的机制保护着从而免受药物作用。
The role of migratory birds in the spread of highly pathogenic avian influenza is not fully understood.
候鸟传播高致病性禽流感的作用尚不完全清楚。
The most common glioma is glioblastoma multiforme and the possible causes are not fully understood.
最常见的神经胶质瘤为神经胶母细胞瘤，神经胶质瘤形成的因素至今尚未完全明朗。
Their paintings were not fully understood by many people at the time and were considered eccentric.
但在当时，他们并不能够被完全理解，甚至被视为左道旁门，而受到“非议”。
Increased cost in moving forward with projects where the information requirements are not fully understood.
由于没有充分理解信息需求，项目的成本增加。
The causes of mood dysfunction, as seen in depressive and bipolar disorders, are still not fully understood.
抑郁症和双向情感障碍中情感紊乱的原因尚未完全弄清。
Being overweight is considered to lead to a higher risk of cancer, although the reasons are not fully understood.
认为超重导致癌有较高的发生危险，尽管原因尚未完全清楚。
Background: gastric electric stimulation (GES) can entrain gastric slow wave, but its mechanism is not fully understood.
背景：胃电刺激(GES)可以调控胃慢波，但其作用机制尚不完全清楚。
It has taken a generation for these changes to be absorbed and still, perhaps, their ramifications are not fully understood.
去承受这些变化已经花去了整整一代人的时间，并且直到现在许多纷繁复杂的结果还是没有得到人们的理解。
So far, the mechanisms of MDR are not fully understood, and clinically no confirmed method to reverse MDR has been reported.
MDR的发生机制目前尚不完全清楚，临床上尚无有效逆转mdr的方法。
More oxygen requires more blood flow, although the connection between cerebral metabolism and hemodynamics is not fully understood yet.
虽然大脑代谢与血氧动力学的关系还没有完全理解，但可以认为运送更多的氧气需要更多的血流量。
While the mechanism of neurogenesis is not fully understood, extra brain cell growth is strongly correlated to learning new things.
虽然神经形成的机制还不完全明了，但可以确知的是额外的脑细胞增长与学习新事物具有强相关。
However, the fundamental chemistry including kinetics of this cementation reaction is not fully understood and warrants further study.
然而，基本的化学反应包括粘结反应的动力学，不完全被了解并且需要更深入的研究。
But the reason is not fully understood. Beyond simply making wiser choices in life, these people also may have biology working in their favor.
但这其中的原因现在还没有完全弄清楚，聪明而长寿的人不仅仅能够在生活中作出明智的选择，而且可能还具有一些对他们有利的生物学行为。
But the reason is not fully understood. Beyond simply making wiser choices in life, these people also may have biology working in their favor.
但这其中的原因现在还没有完全弄清楚，聪明而长寿的人不仅仅能够在生活中作出明智的选择，而且可能还具有一些对他们有利的生物学行为。
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