The term 'mental illness' is difficult to define.
“精神病”这个词很难下定义。
The promise of finding long-term technological solutions to the problem of world food shortages seems difficult to fulfill.
为世界粮食短缺问题找到长期技术解决方案的希望似乎很难实现。
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.
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。
'difficult' is a subjective term, of course: very few people are considered to be 'difficult' by everyone.
“难相处”是一个主观的定义，当然，很少人会让所有人都觉得“难以相处”。
Predicting the return on the stock market over a few years is difficult if not impossible, but predicting it over the long term is easier.
即使可能，预测几年内的股市盈利是有困难的，但是预测长线回报则简单一些。
The reality gap makes it extremely difficult to make anything but very long-term predictions that can be difficult to exploit, even if they are correct.
即使他们是正确的，由于现实差距的存在，他们很难赚到钱，他们拥有的只是很难实现的长期预测目标。
To do otherwise tightens coupling between these structures and makes long term maintenance of the application generally more difficult.
而其他方式则会增加这些结构间的耦合，并且使得应用程序的长期维护变得更困难。
The term, “Cloud”, has become such a household word that it is often difficult to distinguish which particular aspect or type of cloud service is being discussed when the term is used.
“云”这个术语已经成为一个家喻户晓的词了，在使用这个术语时，其往往很难区分正在讨论的是哪方面或何种类型的云服务。
Funding can be unpredictable, short-lived, or inflexible, making it difficult, if not impossible, to launch long-term plans.
供资不可预测、短暂，或不灵活，因此即使不是不可能，至少也很难启动长期计划。
Our correspondent says the battles yet to come over the 2012 budget and long-term plans to cut the deficit are likely to be much more difficult.
我们的记者认为这场“战斗”尚未结束，2012年度的财政预算及减少财政赤字的长期计划会变得愈加困难。
Obesity has been a difficult field for drug companies because the side effects of any drug need to be minimal because of potential long-term use by otherwise healthy patients.
治疗肥胖症的药物的对医药公司来说是个难题，因为这些药物会被肥胖者或者健康的人长期服用，因此其副作用应该足够小。
It is expected that the increased incidence of thyroid cancer from Chernobyl will continue for many years, although the long-term magnitude of the risk is difficult to quantify.
预期因切尔诺贝利事故引起的甲状腺癌的发病率的上升将延续多年，尽管难以量化长期的风险幅度。
"It's been a frustrating and difficult year, but I'm committed to my long-term health," Woods added.
“这是相当困惑和困难的一年，但我要为我长期的健康考虑。”伍兹说道。
It's a stressful time, and one in which long-term planning is becoming more and more difficult.
这是个压力重重的时代，此时要想实现长期的规划越来越困难。
Treatment is difficult once the abuse becomes a long-term behavior, she noted.
她说道，一旦滥用吸入剂成了长期的行为，治疗就会变得非常困难。
The sudden revival of interest in commercial property created fierce competition for certain top assets with long-term tenants that are still difficult to find.
商业地产有趣的突然复苏产生激列竟争，无疑地将导致高端地产的长期租户很难寻找到。
First of all, at least in the short term, we can expect more families will become homeless as foreclosures continue to mount and jobs become harder to hold and more difficult to find.
首先，至少在短期之内我们能预见到会有更多的家庭没有住房，倒闭的企业会持续增多，保住一份工作就变得很困难，而找份工作就更难。
In the long term, however, research shows that it offers children a poor example of how to solve problems or deal with difficult situations.
然而研究显示，从长期来看，这会给儿童造成关于如何解决问题或处理困境的负面影响。
The term "quality of life" is difficult to define.
生活质量"这个词不好下定义。
Part of the reason it's so difficult to reach long-term goals is because there always seem to be more reasons to give up than there are to go on: fear of failure, lack of time or money and so on.
达到长期目标之所以困难，部分是由于放弃的原因似乎总多过坚持的原因：害怕失败，没有充裕的时间和金钱等等。
The results of the seeding technology both shortcoming and long-term are difficult to assess.
人工降雨的短期及长期效果都难以评估。
In the short term, it is difficult to distinguish management skill from luck.
短期内，很难区别管理人的技能与运气。
In the medium term that should not be too difficult.
这在中期是不难实现的。
But just try to think a little bit more long-term, knowing that this was a very difficult Slam for me to compete in anyway.
但我必须从长远目标来看法网，毕竟这个大奖赛对我来说非常难以完成。
It's less difficult for residents in 'destination' locations near colleges, resorts or cities to rent a room or even the house for a few weeks, months or long term.
对于那些住在毗邻大学、度假胜地或者大城市这些"目标"场所的居民来说这不是件太困难的事情，他们可以将一个房间或者整栋房屋出租几周、几个月或者更长的时间。
It's not new; AA and Weight Watchers were around before the Internet, and they help people through difficult and long-term behavior change.
这并不新鲜；嗜酒互戒协会和减肥中心在还没有互联网的时候就已经存在了，他们正是通过艰苦而长期地改变人们的行为来帮助人们的。
It's not new; AA and Weight Watchers were around before the Internet, and they help people through difficult and long-term behavior change.
这并不新鲜；嗜酒互戒协会和减肥中心在还没有互联网的时候就已经存在了，他们正是通过艰苦而长期地改变人们的行为来帮助人们的。
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