They are more common in summer than in winter, and difficult to predict.
这种情况在夏天比冬天更常见，也很难预测。
Currencies are notoriously volatile and difficult to predict. Even investment Banks with their armies of analysts frequently call it wrong.
货币的不稳定性和难预测性是众所周知的，就连投资银行和它们的分析师军团，也常常会出现误判的哦。
In production process, many complex factors which influence cost affect each other and the coupling phenomenon exists, so it is important and difficult to predict the cost.
在生产过程中，影响产品成本的因素多而复杂，因素之间相互影响，存在耦合现象，因此准确预测成本是一个重要又难以解决的问题。
It is often difficult to predict and prepare manufacturing systems for rapid fluctuations in product demand.
经常很难预测产品需求的快速波动和为之准备制造系统。
WHO also noted, early on, that influenza viruses are unstable and can undergo rapid and significant mutations, making it difficult to predict whether the moderate impact would be sustained.
此外，世卫组织很早就指出，流感病毒缺乏稳定性，可以迅速发生重大变异，因此难以预测其影响是否会维持中等程度。
It's difficult to predict consumer demand for EVs, especially since there are other forms of green cars out there for consumers, such as hybrid cars and plug-in electric vehicles.
预测客户对电动汽车的需求颇有难度，尤其是考虑到市面上已有其他类型的环保汽车，比如混合动力车和插电式电动车。
This means that their internal operations can be hard to understand and their behaviour difficult to predict.
这意味着它们的内在经营很难理解并且很难预料它们的行为。
The issues that make it so difficult to accurately predict costs, timelines, and staffing requirements on software projects include.
在软件项目中导致准确预期成本、日程和人员需求很困难的问题包括。
These first-ever projects have many similarities with pure research projects, where it is very difficult to estimate and predict the outcome.
那些第一次的项目同纯粹的研究项目之间具有很多相似之处，它们非常难以评估和预测结果。
This is difficult to predict in advance and is best to identify it with early testing of the actual message flow.
预先预测它是困难的，最好在实际消息流程的早期测试中把它搞清楚。
Customers are less loyal, and global competition more fierce, making it difficult to predict where sales are going.
忠诚的客户越来越少，全球竞争日益激烈，这些因素让销售额更加难以预测。
They are often events difficult to predict, prevent and control.
这些事件往往难以预料、预防和控制。
It's difficult to predict the exact shade the moon will take, which will depend on how much dust and clouds are in the atmosphere during the eclipse.
很难预测那时月面呈现的确切的色彩，因为这是由发生月食时大气中的粉尘和云朵决定的。
Thus, the influence of technology on Earth's carrying capacity is difficult to predict and discern.
然而技术对地球承载能力的影响很难预测和被察觉。
Analysts also warn that until the full extent of the damage caused to Japan's economy and businesses becomes clear, it will be difficult to predict how long the impact on other countries will last.
分析家也警告说到日本此次灾害对日本本国经贸的影响程度明朗以前，都很难预测出对灾害其它国家的影响会持续多久。
Because mashup pages can also be used as sources for subsequent mashups, it is difficult to predict exactly how mashup artifacts, pages, and data sources will be used in the future.
由于混搭页面还可用作后续混搭的来源，因此不可能准确预测混搭工件、页面和数据源将来将如何使用。
The extent, nature, and arrival time of these hazards are difficult to predict. The geographical dispersion of hazard effects will be defined by the following
核爆影响的范围，性质及达到的时间很难预测。核爆在地理上的散播程度受限于如下条件
15% of pregnancies and childbirths need emergency obstetric care because of risks that are difficult to predict.
由于难以预测的风险，15%的妊娠和分娩需要紧急产科保健。
While many companies and LABS have been using x86 architectures for quite some time and don't anticipate variations, disruptive changes in technology are always difficult to predict.
尽管许多公司和实验室在很长时间内一直使用x86体系结构，并且不希望有任何变化，但是技术上的变化总是难以预测的。
You don't have to predict the future if you know the company has the assets and management to do well in difficult times.
如果你知道这家公司在困难时期在资产和管理方面做得很好，你就不必去预测未来。
As the Court says in Pennsylvania Coal, this is a matter of degree and therefore difficult to predict in advance.
正如最高法院在宾州煤炭案中所说的那样，有一个程度的问题，所以很难事先判断。
It today's business climate, as markets constantly change and become more difficult to predict, some analysts believe that long-term planning is pointless.
当今的商业环境，因为不断改变的市场而变得更难预测，一些分析家相信长期的计划是没有意义的。
These events completely changed the world and were difficult to predict-perhaps a few individuals saw a glimpse of the future, but the majority of people were totally unprepared.
这些事件彻底地改变了世界并很难被预测——可能极小部分人察觉到了未来的变化，但是大部分人完全没有准备好世界的改变。
The unexpected event, which is very difficult for the public to predict and control when it happens, has great impact on the society.
突发事件，是指突然发生的、公众难以预测和控制的、具有较大社会冲击力的事情。
Consequently, data about them are abundant, and their behavior is relatively well understood, although still difficult to predict.
因此，关于他们的数据很多，他们的行为相对较易被了解，虽然仍旧很难预测。
As a process it can be difficult to predict (and thus potentially expensive to pursue), but it has always delivered a great game.
作为一个过程，它很难预期(因此花费昂贵)，但这能够让我们发布一个不错的游戏。
Pulmonary arterial hypertension (PAH) can complicate several types of congenital heart disease, and its reversibility is often difficult to predict.
很多类型的先天性心脏病由于发生肺动脉高压而变得更加复杂，并且肺高压的可逆性常难以预测。
Due to many factors affecting pipeline safety, it is difficult to discern pipeline risk and predict accident consequence.
影响管道安全的因素很多，事故的风险识别及事故后果的预测存在一定难度。
It is difficult to predict the results of grinding due to random distribution and shape of grain.
由于磨粒形状和分布的随机性，使得预测磨削加工的结果难以实现。
It is difficult to predict the results of grinding due to random distribution and shape of grain.
由于磨粒形状和分布的随机性，使得预测磨削加工的结果难以实现。
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