让自己长时间聚精会神是很困难的。
It is difficult to make oneself concentrate for long periods.
仔细想来，当时处境是很困难的。
手工收集这些物种是很困难的。
训练鸽子通过叼啄来脱离某种情境是很困难的。
It is difficult to train pigeons to escape from a certain situation by pecking.
“这是一种很困难的情形。”水鼠兰特沉思着说。
"It's a very difficult situation," said the Rat, reflecting deeply.
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。
These methods may be useful for a while, but it is difficult to solve this problem completely.
毕竟，要做双盲测试是很困难的，因为受试者自己可以看到灯是否亮着。
After all, it's hard to do a double-blind test when the subjects can see for themselves whether or not the light is on.
跟上迅速的变化是很困难的。
对学习者来说，说英语时获得信心是很困难的。
One difficult thing for learners is confidence when they speak English.
要他一个人干完所有的农活是很困难的。
对一个孤身一人的男孩来说，在旱季给幼苗浇水是很困难的。
Watering young plants in the dry season was tough for a lone boy.
一些科学家认为，要让机器人真正像人类一样思考是很困难的。
Some scientists believe it will be difficult to make robots really think like a human.
心理学家发现，检测泰德的聪明程度是很困难的，因为测验分数上限对他来说不够高。
Psychologists have found it difficult to test Ted's cleverness because they do not have high enough scores for him.
寻找他会不会很困难的，或者耗时长呢？
以前，要养活世界最多的人口是很困难的。
It was difficult to feed the largest population in the past.
事实上，给一个女孩买一个不是粉红色的玩具是很困难的。
In fact, it is difficult to buy a toy for a girl that is not pink.
这是一项很困难的工作，因为海伦身患疾病，不能看、听和说话。
It was a difficult job as Helen was unable to see, hear or speak because of illness.
现在对于实习生、访客或小偷来说，要偷这样的文件是很困难的。
It would now be difficult for an intern, visitor or a thief to steal a document like this.
现在，要想跟他有新的进展是很困难的，但他还是鼓起勇气走了进去。
It was a hard struggle with him to make new advances, now, but he nerved himself to it and entered.
青少年一般缺乏经验，要他们对自己的未来有一个清晰的设想是很困难的。
It's difficult for teenagers who are generally lacking of experiences to have a clear vision for their future.
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。
Growing enough bracken indoors is difficult, and the moths do not readily exploit cut stems.
例如，纽曼承认像奥克兰那样的丘陵城市建设一个良好的铁路网将是很困难的。
For example, Newman accepts it would be hard for a city as hilly as Auckland to develop a really good rail network.
处于这样的时期，你作为一个银行家，要想尽力去满足你的顾客们的要求肯定是很困难的。
It must be very difficult for you as a banker to try to satisfy your customers during periods like this .
你知道，要进入这个小组是很困难的，自从我还在学校的时候算起，我一定已经试镜过大概十次了。
You know, it is so hard to get into this group, I must have auditioned like ten times since I have been at the school.
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。
Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
对于单个的武士统治者来说，要增加他们的收入是很困难的，因为农民可以用来纳税的大米数量并不是无限的。
It was difficult for individual samurai overlords to increase their income because the amount of rice that farmers could be made to pay in taxes was not unlimited.
在学术部门中，终身教职加上年龄歧视法，使得教职人员流动变得至关重要，大学要想在变化的时代保持与时俱进是很困难的。
Within academic departments, tenure, combined with age-discrimination laws, makes faculty turnover—critical for a university to remain current in changing times—difficult.
回归正常生活是很困难的，但是一些日常小工作——邮件递送就是其中之一——可以帮助居民想起他们的社区仍然是他们的社区。
Returning to normal life can be difficult, but some small routines—mail delivery being one of them—may help residents remember that their communities are still their communities.
在大风浪中为船舶引航是很困难的。
克服睡意是很困难的。
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