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。
In fact, it is difficult to see how journalists who do not have a clear grasp of the basic features of the Canadian Constitution can do a competent job on political stories.
事实上，如果记者对加拿大宪法的基本特征没有清晰的把握，他们很难胜任报道政治事件的工作。
It is difficult to quantify an exact figure as firms are reluctant to declare their losses.
很难确定一个准确的数字，因为各家公司不愿公布它们的亏损情况。
English is difficult to learn at the beginning.
英语刚开始学起来很难。
In large cities, people complain it is difficult to breathe.
在大城市，人们抱怨呼吸困难。
These days it is difficult to imagine a world without books.
如今，很难想象一个没有书的世界。
It is difficult to build a dam in the sea, and the cost is very high.
在海里建水坝十分困难，成本也很高。
It is difficult to figure out a global population of polar bears as much of the range has been poorly studied.
由于大部分有关其生活范围的研究还很少，所以很难统计出全球北极能的数量。
His parents believe that he needs to spend more time on his homework because it is difficult to become a professional sports star.
他的父母认为，他需要花更多的时间在功课上，因为要成为一名职业体育明星是很难的。
Some people complained that it is difficult to deal with wet garbage, as they are asked to remove wet garbage from its bag when dumping.
一些人抱怨说，湿垃圾很难处理，因为按要求在倾倒垃圾时要把湿垃圾从袋子里拿出来。
You won't know what he means at first, for it is difficult to understand him.
起初你不知道他是什么意思，因为很难理解他。
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。
These methods may be useful for a while, but it is difficult to solve this problem completely.
这些方法可能暂时有用，但要完全解决这个问题是很困难的。
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。
It is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean.
很难看出这个理论如何适用于大西洋中脊和印度洋脊之间的板块。
This is difficult to scientifically quantify as such extra-sensory stimuli vary greatly from one autistic individual to another.
这很难用科学的方法来量化，因为这种超感官刺激在自闭症患者之间差异很大。
Targland's officials predict that these measures will be adequate, since it is difficult to collect the tortoises without a vehicle.
塔格兰德的官员预测这些措施将是足够的，因为没有交通工具的话，很难收集这些乌龟。
It is difficult to imagine how this could affect the cattle, but the relationship may help or hinder them in some way not yet recognized.
很难想象这会对牛产生怎样的影响，但这种关系可能会以某种未知的方式帮助或阻碍牛群的发展。
It is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part.
很难看出这如何适用于南大西洋的山脊，在那里，非洲板块和美洲板块都没有下沉的部分。
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。
But if improving their hunting luck was the chief motivation for the paintings, it is difficult to explain why only a few show signs of having been speared.
但是，如果增强他们的狩猎运气是这些画的主要动机，那么就很难解释为什么只有少量画作有被长矛刺过的迹象。
The language of kabuki is difficult to understand, but earphones are provided to explain the story, and there are also earphone services available in English.
歌舞伎中使用的语言很难理解，但是会提供耳机来解释故事的内容，还有英文解说服务。
It is difficult to understand how reduced predation would lead to sudden increases in Acanthaster numbers in several places at the same time in specific years.
很难理解捕食减少是如何导致在特定年份的同一时间内，几个地方的棘冠海星数量突然增加。
It is difficult to query and correlate these events.
查询及关联这些事件是困难的。
However, the significance of these changes is difficult to assess.
不过，对这些变化具有的重要意义很难做出评估。
It is difficult to analyse Freud's doctrine of psychoanalysis.
分析弗洛伊德的精神分析理论很困难。
It is difficult to configure and there are no documented procedures.
它配置困难，而且过程没有文档说明。
It is difficult to convey delicate shade of meaning in a translation.
在译文中传达意义上精微的差别是很不容易的。
Advertising, the lifeblood of many broadcasters, is difficult to do globally.
许多公共广播机构的命脉所在——广告，在全球范围内很难操作。
But it is difficult to compare a 1932 Picasso with one painted in 1904-5.
但是很难将毕加索1932年的作品与1904-5年的画作相提并论。
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