我应该为我的心理学课程做文献回顾，但是很难找到文章。
I'm supposed to do a literature review for my psychology course, but I'm having a hard time finding articles.
恐龙的消失未必是由天文事件引起的，但是很难找到其他的解释。
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But alternative explanations are hard to find.
十年前，光滑的塑料雪橇开始流行起来；它们比木制雪橇跑得快，但是很难操控，也很慢。
Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow.
Chrome上有bug但是很难利用。
他们尽力解读议案当中的措辞，但是很难懂。
They try to read the wording of the initiative, but find it forbidding.
但是很难核实多种产品和配件产品信息的来源。
However, it is difficult to verify where the information about the source of various products and product parts is coming from.
但是很难解释美元这样的疲软状态，因为赤字低于3年前。
But it is hard to explain the recent weakness of the dollar in this way, since the deficit is lower than it was three years ago.
但是很难找到这样两个智能手机平台，却做着大相径庭的生意。
But it's hard to find two smartphone platforms with such drastically different businesses.
约会网站的老板们宣称这种例子很罕见，但是很难检测。
Dating-site bosses maintain that such instances are rare, but detecting them can be tricky.
两者是有微小的差异，但是很难定义网页和网络程序有什么不同。
There should be some minor differences, but it’s hard to define the difference between a web page and a web application.
但是很难将毕加索1932年的作品与1904-5年的画作相提并论。
But it is difficult to compare a 1932 Picasso with one painted in 1904-5.
但是很难知道谁的阅读能力能得到改善，需要多少额外的帮助。
It is hard to know who will be able to improve reading skills over time, and how much extra help is necessary.
评估的工具和方法有很多种，但是很难应用在特定的软件项目中。
There are many estimating tools and methods out there, but it is difficult to apply them effectively during the course of specific software projects.
人与狗的关系可以很好，但是很难，正如莱维琳和他的忠犬杰乐一样。
This relationship can be wonderful but difficult - like in the story of Prince Llewelyn and his dog Gelert.
你可以教艺术家如何使用软件和图形工具，但是很难把一个工程师培养成艺术家。
You can teach artists how to use software and graphics tools, but it's much harder to turn engineers into artists.
这两个发行版的下载文件的大小差别较大，但是很难一眼就看出其中的特性差别。
They differ quite a bit in downloaded file size, but finding the features at first glance is a little trickier.
人们往往很容易批评别人但是很难认真的审视自己并且接受别人的批评。
It's very easy for people to criticize and very hard to look at yourself and take criticism.
虽然我期待更多的坏消息从金融领域传来，但是很难想象它会变得更糟。
Although I expect more bad news from the financial sector, it's tough to imagine it getting much worse.
test命令非常强大，但是很难满足其转义需求以及字符串和算术比较之间的区别。
The test command is very powerful, but somewhat unwieldy given its requirement for escaping and given the difference between string and arithmetic comparisons.
使用垃圾邮件过滤解决方案可以捕获大量的垃圾邮件，但是很难实现100%的可靠性。
Using a spam filtering solution catches a significant amount of spam, but many fail to reach 100 percent reliability.
尽管人们应该能够读取它，但是很难想象一个人会去阅读包含7百万个节点的XML文件。
People are supposed to be able to read it, but it's hard to imagine a human trying to read an XML file with 7 million nodes.
您可能是个天下难找的优秀架构师，但是很难在所有事情方面满足所有人的需要。
You may be a darn good architect, but it's hard to be all things to all people!
常常遇到这样的情况，就模式的基本想法能够广泛达成一致，但是很难统一到具体的语法上来。
It is common to have a set of basic ideas for a schema widely agreed upon, but not the precise syntax.
在这个主题上没有太多的争论，但是很难保证开发者不将其作为取得免费的生产实例方式。
There isn’t much debate on this topic, but ensuring that developers don’t use it as a way to get free production instances is hard.
父母常常诉说自己的小孩挑食，但是很难判断是因为他们每次只吃一点，还是他们喜欢每天吃同种食物。
Parents often describe their toddlers as being picky eaters, but it is often hard to know if that it is because they eat small amounts at a time or because they like to eat the same things every day.
这些变化并不是在一夜之间形成的，但是很难找出是在什么时候开始，我们超越了原始的呼噜声而说话的。
These changes didn't evolve overnight, but it's hard to pinpoint when we moved beyond primitive grunts and started talking.
虽然安卓应用广泛，但是很难找到一款基于安卓系统的智能手机在流行度上赶得上iPhone。
Despite its wide use, it's hard to find a single Android-based smartphone that can match the iPhone in terms of overall popularity.
虽然安卓应用广泛，但是很难找到一款基于安卓系统的智能手机在流行度上赶得上iPhone。
Despite its wide use, it's hard to find a single Android-based smartphone that can match the iPhone in terms of overall popularity.
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