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。
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。
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”。
The mechanisms underlying this important and clinically relevant phenomenon are not fully understood.
然而，这个重要的临床相关现象的机制尚不完全清楚。
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 pharmacology of aspirin is complex and was not fully understood until the 1960s, but dosage is crucial.
阿司匹林的药理作用十分复杂，直到二十世纪六十年代才被完全了解，但其服用剂量是很重要的。
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。
However, the innate immune defects and the influence of TLR-signaling in DM patients are not fully understood.
糖尿病患的先天免疫缺陷可能的调控有关，然而目前对其调控机制并不明瞭。
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。
The cause of diabetic diarrhea is not fully understood, but autonomic neuropathy is thought to be an underlying mechanism (1).
糖尿病腹泻的原因还没有完全弄清楚，但是自主神经病变被认为是一个基本机制(1)。
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。
The mechanisms regulating hypothermia are not fully understood, but many cytokines have been shown to induce or modulate hypothermia.
尽管降低体温的调节机制还没有完全清楚，但已显示许多细胞因子可导致或调节低体温。
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。
Although several pharmacological activities of ranolazine have been described, the precise way the drug works is not fully understood.
尽管已经说明了雷诺嗪的一些药理活性，但是该药的确切作用机制仍未完全了解。
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 later research found that obese people don't lack sufficient leptin. For reasons not fully understood, their cells are resistant to it.
然而后来的研究发现，肥胖的人并不缺乏足够的瘦素。其原因尚不完全清楚，但他们存在瘦素抵抗。
Supervisor should be immediately contacted if there is any safety issue not covered in the procedure or any item therein not fully understood.
程序内若有末提及的安全问题或不能完全理解的条例，要立即和主管联系。
Recently UK researchers linked low solar activity and freezing cold winters in Europe. However, the mechanism behind this is not fully understood.
最近，英国研究人员认为欧洲的寒冬天气与太阳活动量减少有关，可目前还未充分了解这种现象背后的机制。
How rain clouds become charged is not fully understood, but most rain clouds are negatively charged at the base and positively charged at the top.
雨云是怎样被充电尚未完全被了解，但是大部分的雨云在底部充以负电在顶部充以正电。
Note: Since astronomers have not fully understood the mechanism account for the brightening of comets, they can only predict by referring to past comets.
注：由于天文学家还未完全掌握彗星增光的机制，因此只能参考过去其他彗星的情况作出预报。
Note: Since astronomers have not fully understood the mechanism account for the brightening of comets, they can only predict by referring to past comets.
注：由于天文学家还未完全掌握彗星增光的机制，因此只能参考过去其他彗星的情况作出预报。
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