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。
Growing enough bracken indoors is difficult, and the moths do not readily exploit cut stems.
在室内种植足够的蕨菜是很困难的，而且这些蛾子不容易利用割下的茎秆。
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。
Reaching decisions is difficult, especially since all agreements by custom must be reached by consensus.
达成决定是困难的，特别是因为所有根据习惯达成的协议都必须通过协商一致达成。
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。
Punishing people for using hand-held gadgets while driving is difficult enough, even though they can be seen from outside the car.
惩罚那些开车时使用手持设备的人已经够难的了，即使从车外都能看到他们。
That lack of curiosity produces a relative lack of knowledge, and the lack of knowledge is difficult if not impossible to compensate for later on.
好奇心的缺乏导致了相应知识不足，而知识的缺乏即便可以弥补，但真正做到也是很难的。
Determining the functions of play is difficult because the functions may be long-term, with beneficial effects not showing up until the animal's adulthood.
定义玩耍的功能是困难的，因为这些功能可能是长期性的，其积极影响要到动物成年后才会显现。
Being a student today with miserly grants and limited career prospects is difficult.
眼下，做一名补助金少得可怜、职业前景渺茫的学生可真不容易。
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。
Doing housework is difficult for us.
做家务对我们来说很难。
English is difficult to learn at the beginning.
英语刚开始学起来很难。
The maths test is difficult and makes people nervous.
数学考试很难，使人紧张。
In large cities, people complain it is difficult to breathe.
在大城市，人们抱怨呼吸困难。
It is difficult for corrupt officials to hide abroad nowadays.
如今腐败官员很难在国外藏身。
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。
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, however, for scientists to get close to the bears.
然而，科学家们很难接近这些熊。
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。
"Shaolin Kung-fu is difficult," said Master Li, "You must practice every move many times."
“少林功夫很难，”李师傅说，“你必须把每个动作练习很多次。”
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。
If you're used to a very relaxing class, learning to develop in a strict environment is difficult.
如果你已经习惯了氛围轻松的课堂环境，那么在严肃的氛围下学习就会变得很困难。
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。
I learned that the road to success is difficult and we need to have courage and work hard.
我知道了成功之路是艰难的，我们需要有勇气和努力工作。
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。
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。
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