在拿破仑战争时期，可能有许多间谍和情报军官，但是通常极难找到他们实际提供或者工作的材料。
There may have been many spies and intelligence officers during the Napoleonic Wars, but it is usually extremely difficult to find the material they actually provided or worked on.
同时，行为遗传学研究极难于重复。
Also, behavioral genetics studies are notoriously difficult to replicate.
而这种液态纯氢是一种极难获取的物质。
通缩一旦出现就极难摆脱，日本就是很好的实例。
And deflation, once entrenched, is fiercely difficult to dislodge, as Japan has found.
黄金宝螺的贝壳极难找到，它们为收藏家所推崇。
Golden cowrie shells are among the hardest shells to find and are prized by collectors.
生命中许多时候稀奇古怪，极难把握，又难以置信。
Some moments in life are almost impossible to grasp – surreal. I was in a state of disbelief.
这导致这些人极难说出自己的感受或跟别人普通交流。
This causes such humans to have great difficulty verbalizing how they feel or communicating in general.
但第三类，由于关联到社交涵义，所以是个极难的挑战。
The third category, however, tied to social meaning, presents an extremely difficult set of challenges.
了解降低胰腺癌危险的途径是非常重要的，因为它可能极难治疗。
Understanding ways of reducing the risk of pancreatic cancer is very important, because it can be very difficult to treat.
那些是特别用来记录生活中内心的体验，是极难被翻译给别人的。
The words were specifically written to document an inner experience of life, the kind that a person has extreme difficulty translating to anyone else.
始终记住，气候市场是变幻无常，价格变动剧烈，极难把握的市场。
Always remember that weather markets are mercurial, extreme in price fluctuations, and very difficult to master.
这种设计唯一的缺陷是——发动机很难接近，频繁的维护极难实现。
This design poses just one disadvantage — the engines aren't easily accessible, making frequent maintenance essentially impossible.
像吴婷这样的患者害怕被他人评价并坚信这些评价会是消极难堪的。
Sufferers like Wu fear putting themselves through an evaluation by others, convinced that such assessment will be negative and embarrassing.
她说，即使是闻名遐迩之人，也极难看出外在事件对其内心造成的影响。
Even the eminent, she says, show little sign of the inner consequences of outward affairs.
虽然流感病毒极难预测，但希望在整个大流行期间这一中度影响不发生恶化。
Although influenza viruses are notoriously unpredictable, it is hoped that this moderate impact will continue throughout the duration of the pandemic.
人们排着长长的队伍等待着商店开门，争着第一个进去买那些极难买到的商品。
Line by the store is waiting for opening to get inside first hoping to buy some hard-to-get goods.
硝基苯类化合物是一类高毒性的有机污染物，它们性质稳定，极难生化降解。
Nitrobenzene compounds, a highly toxic compound, is very difficult to be degraded and its chemistry property is very stabilizing.
推理统计学是一套已定形了的方法体系，它解决的是光凭人脑极难解决的另一类问题。
Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human mind.
海蒂和我模样完全一样，布满雀斑的肩膀、肥胖粉红的脚趾头，还有极难梳理的乱发。
HATTIE and I are identical right down to our freckled shoulders, fat pinky toes, and the comb-eating snarls in our hair.
但我们还是不知道，在某些人群中这样的控制机理失效的原因，只知道这样的疾病极难治疗。
It is still not known why the control mechanism breaks down in some people, but the results are very difficult to treat.
处在深睡眠状态的人极难被唤醒，如果是儿童进入这种状态，唤醒他们几乎是不可能的任务。
It is very difficult to awaken a person in deep sleep, and children in this state may be nearly impossible to wake up.
在实践中，这样的需求极难实现，让我们再回到示例场景，评估这项需求（请参见图5）。
This requirement is very difficult to implement in practice, but let’s go back to the example scenario to evaluate this requirement (Figure 5).
目的是要用作戏谑，在很多方面，使人怀疑正义之城的概念，或至少是要指明其极难令人置信。
That it is intended as a kind of joke to, in many ways, discredit the idea of the just city or at least to indicate its extreme implausibility.
如果你领悟了极难下咽的东西是习惯和传统之时，交易的东西似乎转换为美味舒适vs健康、健壮和活力。
If you understand that most poor eating is habitual and traditional, the trade off seems to be that of taste and comfort vs. health, fitness and vitality.
夜蛙往往极难发现，他们生活在水流湍急的溪流中或者潮湿的森林地带并且仅在雨季的夜间才会出来活动。
Night frogs are extremely hard to find, coming out only at dark and during the monsoon season, living either in fast-flowing streams or on moist forest ground.
尽管泛型类型是制作健壮代码的强大武器，但我们已经演示了误用它们会使代码不再健壮而且极难诊断和修正。
Although generic types can be a powerful weapon for producing robust code, we've shown how their misuse can lead to code that is not only less robust but also extraordinarily hard to diagnose and fix.
因此，我们无须惊讶，“有时司法心理分析师或精神病学家以及法官们都极难了解事实。”Owens表示。
So no wonder it can sometimes be so “devilishly difficult for forensicanalysts or psychiatrists, as well as juries, to get at the truth, ” said Owens.
最初使我醍醐灌顶的是，像癌症这样具有扩散性且极难对付的东西一定属于生命本身，是生命故事深处的一部分。
What struck me from the outset is that something as pervasive and stubborn as cancer must be a deep part of the story of life itself.
最初使我醍醐灌顶的是，像癌症这样具有扩散性且极难对付的东西一定属于生命本身，是生命故事深处的一部分。
What struck me from the outset is that something as pervasive and stubborn as cancer must be a deep part of the story of life itself.
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