It is difficult for us to imagine what life was like for slaves in the ancient world.
我们很难想象古代奴隶的生活是怎么样的。
It is difficult for a student who knows little of English to talk to foreigners with confidence.
对于不太懂英语的学生来说，和外国人自信交谈是困难的事情。
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。
Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
给它安装无线电设备是很困难的，而且仅凭肉眼观测也太不可靠，无法对它的行为进行确切的观察。
Machiavelli, he notes, concluded that "one ought to be both feared and loved, but as it is difficult for the two to go together, it is much safer to be feared than loved."
他指出Machiavelli 总结说： “一个人应该既让人敬畏又让人爱戴，但由于两者很难同时存在，因此让人敬畏比让人爱戴要安全得多。”
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。
It is difficult for corrupt officials to hide abroad nowadays.
如今腐败官员很难在国外藏身。
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, however, for scientists to get close to the bears.
然而，科学家们很难接近这些熊。
For the students in one small village in China, it is difficult.
对于中国一个小村庄的学生来说，这很困难。
It is difficult for me to get up early on Monday mornings.
星期一早起对我而言是困难的。
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 for them to write and read pinyin, so I taught them over and over.
他们读写拼音十分困难，所以我一遍又一遍地教他们。
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。
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。
It is difficult for numeric people to keep track of the change in numbers even when the total is very small.
即使数据总数很小，数据工作者也很难追踪数字的变化。
Crowding on Mooreville's subway frequently leads to delays, because it is difficult for passengers to exit from the trains.
穆尔维尔的地铁拥挤不堪，经常导致晚点，因为乘客很难从火车上出来。
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。
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。
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