当形势不断变化时，在网络安全领域保持领先地位是困难的。
It's hard to stay ahead of the game in network security when the landscape is constantly changing.
星期一早起对我而言是困难的。
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。
It is difficult for a student who knows little of English to talk to foreigners with confidence.
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。
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.
然而，这种决定性的论点没有承认，在西南地区的地方环境的变化使得对该环境进行概括是困难的。
However, such deterministic arguments fail to acknowledge that local environmental variability in the Southwest makes generalizing about that environment difficult.
尽管制造商和零售商能够有一定把握地预测总需求，但要准确地预测需求将如何在他们销售的众多SKU中分配是困难的。
Even though manufacturers and retailers can forecast aggregate demand with some certainty, forecasting accurately how that demand will be distributed among the many SKU's they sell is difficult.
我们知道找回一具尸体是困难的事情，因为遗弃在荒野的任何尸体都将被吃掉的，但是我们认为我们可以查到这个男人的姓名的。
We knew it was difficult to recover a body because any corpse left in the wild will be eaten, but we thought we could learn the name of the man.
查询及关联这些事件是困难的。
每隔20或30秒进行飞机起飞是困难的。
对于不满意的结果，为其辩护是困难的。
It's very difficult to rationalize away any unsatisfactory results.
当然，实用程序会制造出电，在一个有时是困难的过程中。
And of course the utility would love to make electricity in the process which is sometimes difficult.
当然，要随时了解哪个安排更具进化适应性往往是困难的。
Of course, it's often hard to know which agenda is most evolutionarily adaptive at any moment.
社会变革是困难的，因此有些项目难免比预期缩短或延长。
Social change is difficult, and some projects are bound to fall short or take longer than expected.
而且有很好的理由来怀疑这个验证是困难的假设。
And there are good reasons for being skeptical of making assumptions that are difficult to prove.
技术开发是困难的，但是获许使用，则面临更大的挑战。
Developing this technology was difficult, but not as big a challenge as getting permission to use it.
安全专家表示对调查者来说要证明哪个国家处于攻击状态是困难的。
Security experts said it would be difficult for investigators to prove which nation was behind the attack.
而且几乎不会向母亲提及，所以要知道有多少孪生子消逝了是困难的。
They may not even be mentioned to the mother, so it is hard to know just how often a twin goes missing.
预测是困难的，因为美国的计划就是一个各色方案的大杂烩。
Establishing an expectation is difficult, though, since the American plan is a grab-bag of different initiatives.
但是，在吃大餐的时候摄取足够的食物来避免失重，是困难的。
But taking in enough food on the feasting days to avoid weight loss proved difficult.
纠正这种偏差是困难的，因为它需要了解产品构成的详细信息。
To correct for that bias is difficult because it requires detailed knowledge of how products are put together.
在年终剩余现金往往是困难的。而这件事在今年可谓难上加难。
Surviving the year-end cash crunch is always tough. This year, it's going to be even tougher.
对于开发人员来说，在计算机上跟上被建议的重大改变是困难的。
It was tough for the developer at the computer to keep up with significant changes that were being suggested.
目前，对医生们来说分辨出那些正朝着绝经期早期迈进的女性是困难的。
At the moment, it is hard for doctors to tell which young women may be headed for early menopause.
如果爬山或下山被视为是困难的，我们的感知就会受到这个观点的影响。
If we see going up or down a hill as difficult, our perception could be influenced by our point of view.
然而，对于由EJB代码生成的业务流程而言，确定适当的方法是困难的。
However, for business processes with generated EJB code, it is difficult to identify the appropriate methods.
由于以字符串形式来描述同一日期的方式很多，所以日期的输入是困难的。
Date input is hard because there are so many ways to represent the same date in string form.
不幸的是，这使得从“用户模型”追溯到系统模型中的系统参与者是困难的。
Unfortunately, this makes it difficult to trace such "user models" to the System Actors in the System model.
不幸的是，这使得从“用户模型”追溯到系统模型中的系统参与者是困难的。
Unfortunately, this makes it difficult to trace such "user models" to the System Actors in the System model.
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