It's a concept that is difficult to render into English.
这个概念难以用英语来表达。
Sometimes that standard is quite difficult, if not impossible, to achieve.
有时那个标准，即使并非不可能，也是很难达到的。
Another theory is that developed skulls are used to treat difficult foods like rabbits, reindeer, foxes, and horses.
另一个理论认为发达的头骨是用来对付像兔子、驯鹿、狐狸和马这样难嚼的食物的。
Management is all about making difficult tradeoffs in conditions that are always uncertain and often fast-changing.
管理就是在不确定且经常快速变化的条件下做出艰难的权衡。
In our daily life, robots are often found to do work that is too dangerous, boring, difficult, or dirty.
在我们的日常生活中，机器人经常做太危险、无聊、困难、或脏的工作。
The good news is that the operation is not difficult.
好消息是手术并不困难。
It is getting much easier to travel nowadays, but increasingly harder to get away from people, and that is perhaps the most difficult thing for holiday makers.
现在旅行变得越来越容易了，但是要远离人群却越来越难，这也许是度假者最困难的事情。
It is universally acknowledged that it's very difficult to shake off bad habits.
众所周知，摆脱不良习惯是非常困难的。
In fact, it is difficult to buy a toy for a girl that is not pink.
事实上，给一个女孩买一个不是粉红色的玩具是很困难的。
Another is that long and sophisticated vocabulary choices make listening more difficult.
另一个原因是，冗长和复杂的词汇听着更费劲。
It is difficult to isolate the factors that led to the next development—the emergence of urban settlements.
推动其进一步发展，即城市聚居点出现的诸多因素，是很难孤立出来看待的。
There is clear evidence that the most difficult feeling of all to interpret is bodily pain.
有明显证据表明，最难以描述的感受是来自于身体的伤痛。
That part of Brazil is very dry and farming is often difficult there.
巴西的那部分地区非常干旱，耕种也通常很困难。
Her mother thinks that reading text on a phone screen is difficult for people at her age.
她妈妈认为对于她们这样年龄的人来说，在手机上看短信有些困难。
It is notoriously difficult to teach adults skills that do not have an immediate impact on their everyday lives, and many literacy campaigns in other countries have been much less successful.
众所周知，教成年人一些对他们日常生活没有直接影响的技能是非常困难的，而其他国家的许多扫盲运动都远远没有我们这么成功。
In wider and more difficult areas of life, there is evidence to indicate that natural surroundings improve all kinds of things.
在更广阔，更艰难的生命领域中，有证据表明自然环境可以改善各种事情。
That means making some difficult decisions with elderly patients, and going against the misguided belief that when it comes to health care, more is always better.
这意味着要对老年患者做出一些艰难的决定，突破健康护理越多越好这一错误的理念。
The divorce rate among the movie stars is so high that it is difficult to know who is married to whom.
电影明星的离婚率如此之高，导致人们很难知道谁和谁结婚了。
Poverty rose and that is a factor that makes our job more difficult.
贫困问题加剧是使我们的工作变得更加困难的一个因素。
He is concerned that students may find the novel difficult to read.
他担心学生们会觉得这本小说很难读。
That kind of thing is difficult.
那种事很难办。
The English language is made up of the grammar and vocabulary which people from many different countries brought to Britain and that is why English has so many difficult rules that confuse people.
来自不同国家的人们把词汇和语法带入英国，形成了英语，这就是为什么英语有那么多让人困惑的规则的原因。
Thing is that it's very difficult to classify.
问题是很难进行分类。
Furthermore, the number of interactions is so great that they are difficult to analyze, even with the help of large computers.
此外，相互影响的现象非常多，即使借助大型计算机也很难对它们进行分析。
The difficult question is how to find that profitable niche and protect it.
这个难题是：如何找到有利可图的利基市场并加以保护。
The more difficult a child's life circumstances, the more important it is for that child to find joy in his or her classroom.
一个孩子的生活环境越是困难，他或她在课堂上能够找到快乐就越重要。
Luckily, that is not so difficult.
幸运的是，那并不那么难。
I think that it's true that the economy is difficult and there is a big challenge in front of us.
我认为经济形势确实很困难，我们面临着巨大的挑战。
Some people believe that it is difficult to protect users' privacy on social network sites.
一些人认为很难在社交网站上保护用户的隐私。
It is also true that it is difficult to think of a single such system that has not, for better or worse, been substantially modified by human culture.
同样，很难想象一个这样的系统：不管是好是坏，都没有经过人类文化的实质性修改。
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