Reconstructing the climate changes of the past is extremely difficult, because systematic weather observations began only a few centuries ago, in Europe and North America.
重建过去的气候变化是极其困难的，因为在欧洲和北美，几个世纪前才开始系统的天气观测。
It's true that your father will find it extremely difficult to get out of the habit of smoking, but he should try his best for health's sake.
确实，要你父亲改掉吸烟的习惯很难，但是为了健康，他应该尽力戒除。
Changing eating patterns can be extremely difficult.
改变饮食方式可以是极其困难的。
"Not only does this kill some cells, it's extremely difficult to do," Whitesides says.
这不仅会杀死部分细胞，还很难操作。
If your design relies on humans to remember processes, compliance will be extremely difficult.
如果您的设计依赖人类记住流程，实现遵从性就会极其困难。
Changing behavior - even when it's life threatening, such as smoking - is extremely difficult.
改变行为是非常困难的-即使知道他对生命的威胁，如吸烟。
Interface bloat: Making an interface so powerful that it is extremely difficult to implement.
接口膨胀(Interface bloat)：把一个接口做得过于强大以至于极其难以实现。
Some relatives complain that the partners they take care of are extremely difficult to deal with.
有些亲属抱怨说，他们照护的伙伴特别难对付。
Mister Sagan worked for many months on what to say in the message. It was an extremely difficult task.
萨根先生为这条信息应该说些什么忙了好几个月，这是一项非常艰巨的任务。
Fundamentally, he believes that creating impregnable tickets is extremely difficult, if not impossible.
从根本上，他相信，创造出坚不可摧的彩票是极其困难的，如果不是不可能的话。
The lack of such a scheme makes it extremely difficult for international students to raise financing.
缺少了这个方案，国际留学生筹集资金就变得十分困难。
When I was packing for university, I found it extremely difficult to let go of some of the things I owned.
当我即将离开大学校园的时候，我发现要舍弃一些东西是及其困难的事。
It is extremely difficult to produce the visual output when deriving the UML model from an XML schema.
从XML模式派生uml模型时生成可视化的输出非常困难。
The third category, however, tied to social meaning, presents an extremely difficult set of challenges.
但第三类，由于关联到社交涵义，所以是个极难的挑战。
Without CCS it's going to be extremely difficult to meet any reasonably forward-leaning climate change goal.
如果没有碳捕捉和存储技术的支持，实现任何合理的前瞻性气候变化目标都将变得极为困难。
Such a system would be extremely difficult for day-to-day management and organization of data by human users.
人类用这种系统进行日常的数据组织和管理是极其困难的。
The only problem is that it can be extremely difficult to achieve such a following, which is where we come in.
唯一的问题是，拥有这么多追随者是一件很难的事，而这也正是我们的切入点。
It's extremely difficult to perceive that the source of these problems is our own inappropriate attitudes.
很难理解这些问题的根源是我们自己不恰当的态度。
Furthermore, this sort of error is extremely difficult to track when you are globalizing your application.
另外，在全球化应用程序时很难跟踪这种类型的错误。
They do a great job, they are operating in extremely difficult circumstances and they are trying to protect us.
他们很棒，他们在极其艰难的环境下依然努力保护我们。
It's extremely difficult to get to his house. Tons of snow hamper your movements. Ski is the only solution.
通往居所的道路走起来十分艰难，厚重的积雪拖拽着你的脚步，滑雪前往是唯一方式。
Speed and reliability in travel search, especially around flights, is an extremely difficult area to master.
旅游搜索的速度和可靠性最难掌控，尤其是对于机票搜索。
But it is also this natural tendency that makes trading (which looks like it should be easy) extremely difficult.
但是就是这个自然倾向导致交易(看起来很简单)极度困难。
I have never played a game against Bayern that was not extremely difficult and a test of endurance for both teams.
我从没有与拜仁踢过比赛，这不是很困难，对两支球队来说都是一场耐力的考验。
In the early days of theater costuming, it was extremely difficult to make blue dye, and thus expensive to purchase.
在剧院服饰装扮的早期，要制造蓝色的染料特别困难，所以购买的费用也很高昂。
Customizing wireless security is extremely difficult, especially given the limited computing power on handheld devices.
定制无线安全性非常困难，尤其是对于手持设备上有限的计算能力。
The number of scanners, and the difficulty of controlling dreams, has meant that the experiment was extremely difficult.
需要扫描仪的数量以及梦境控制的难度都使得实施该实验相当困难。
The number of scanners, and the difficulty of controlling dreams, has meant that the experiment was extremely difficult.
需要扫描仪的数量以及梦境控制的难度都使得实施该实验相当困难。
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