如果不知道自己的需求，则难以确定工作何时完成。
If you don't know what you want, it will be difficult to determine whether your work is finished.
所有这些细菌的活动状况尚难以确定——细菌不易培养。
What all these bacteria are doing is tricky to identify-the bacteria themselves are difficult to cultivate.
这不仅仅是一个痛苦的经历，这还让医生难以确定疼痛的原因。
Not only can this be a painful experience, but it makes it rather difficult to track down the source.
真正的生活技能难以测量，难以确定，然而却使人受益匪浅。
Real life skills are harder to measure, harder to pin down, but so much more beneficial.
实际损失难以确定的，可以按照侵权人因侵权所获得的利益确定。
If it is difficult to determine the actual losses, the actual losses may be determined on the basis of the gains which the infringer has obtained from the infringement.
如：训练时易陷入局部极小、收敛速度慢、隐结点个数难以确定等。
Such as: existing partial minimum, the slow convergence, selecting the number of hidden nodes difficult and so on.
简言之，在核心的网络业务和线下广告两方面，新浪近期的前景如何都难以确定。
In short, it is difficult to know what the immediate future holds for Sina, in both its core online business or its foray into offline advertising.
收益也许短暂而且难以确定，但你每活一天，花费就肯定会不断出现。
Gain may be temporary and uncertain, but ever while you live, expense is constant and certain.
当你难以确定时，默认为“都有”，这样您就将所有的基本类型都涵盖了。
Whenever you are in doubt, default to "both," so that you'll have all bases covered.
悬移质不平衡输沙研究中，往往有一重要参数即恢复饱和系数难以确定。
Usually it is difficult to determine the coefficient of saturation recovery for nonequilibrium transportation of suspended load.
客户满意度在不同的行业与企业有着不同的定义，其评价标准也难以确定。
The client degree of satisfaction has different definition in different industry and enterprise, therefore the standard of evaluation is difficult to ascertain.
如果企业的主要资产是无形资产，那么它们利润的产生地就更加难以确定。
When corporations' main assets are intangible the location of their profit is still more difficult to pin down.
流感大流行发生的时间和严重程度难以确定，但是专家们预测大流行将会发生。
The timing and severity of a flu pandemic is uncertain, but experts predict a pandemic will occur.
毕竟诚实与不诚实所涉及的可能是太复杂而难以确定的一系列认知和社会因素。
After all, being honest or dishonest involves a set of cognitive and social factors which may prove too complex to pin down.
在隧道衬砌设计中，围岩压力通常是最主要的荷载，也是最难以确定的荷载。
When designing tunnel lining, rock pressure is the most important load and very difficult to determine.
此种方法解决了划分产业界限难以确定的问题，为科学划分产业提供了有效方法。
The method can solve the problem in determining the bounds of classified industry. It provides an effective method for scientific classified industry.
因此，所有木质包装材料的真实原产地难以确定，从而使其植物检疫状况也不能确定。
Therefore, the true origin of any piece of wood packing material is difficult to determine and thus its phytosanitary status cannot be ascertained.
在模糊偏好关系的基础上建立选择函数，其困难在于难以确定模糊偏好关系的传递性。
A choice function is made on the basis of fuzzy relations of preference. It is difficult to get transitivity properties of fuzzy preferences.
事实上，对于某些存储库而言，会难以确定完全映射在Repository对象本身上的是什么！
In fact, for some repositories, it can be difficult to determine what exactly is going to map to the Repository object itself!
针对化工系统模型难以确定的问题，提出了基于对象的有向无环图节点粒度的转换方法。
To solve the difficulty in modeling a chemical system a new node granularity transformation method based on object directed acyclic graph was proposed.
有一个流传已久的笑话：“佩戴一只手表的人常常知道时间，而佩戴两只手表后反而难以确定了”。
There's an old joke that says "a man with one watch always knows what time it is; a man with two watches is never sure."
布朗指出，他不能说儿童时期受到刺激就是导致早逝的真实原因，因为仅通过一项研究往往难以确定原因。
Brown notes that he can't say whether the childhood stressors actually cause premature deaths, as causation is always difficult to establish with a single study.
那天早上，当我在电脑里输入我的文章时，不安困扰着我，那是一种让我难以确定的生理感觉。
What bothered me that morning as I typed up my piece was a disquiet, a physical sensation I could not quite identify.
傅立叶变换只能确定一个函数奇异性的整体性质，而难以确定奇异点在空间的位置及分布情况。
Fourier transform only makes sure the feature of a function singular and can not confirm the position and of singular point on space.
当今世界的一切都难以确定，就算是在看似稳定的房地产市场，过去的成绩也不是未来业绩的保证。
In today's uncertain world, past performance is no guarantee of future performance, even in seemingly solid markets.
用傅里叶变换对含有噪声干扰的试验数据进行滤波，通常难以确定奇异点在空间的位置及分布情况。
It is difficult to confirm the position and distribution of singularities in space generally when the test data with noise disturbance is filtered by Fourier transform.
虽然具体数字还远远难以确定，但一些学者认为，地震带山区约20万名居民需要永久性的重新安置。
Though the figures are far from definitive, some scholars think perhaps 200,000 inhabitants of mountainous areas in the earthquake zone will need to be permanently resettled.
虽然具体数字还远远难以确定，但一些学者认为，地震带山区约20万名居民需要永久性的重新安置。
Though the figures are far from definitive, some scholars think perhaps 200, 000 inhabitants of mountainous areas in the earthquake zone will need to be permanently resettled.
虽然具体数字还远远难以确定，但一些学者认为，地震带山区约20万名居民需要永久性的重新安置。
Though the figures are far from definitive, some scholars think perhaps 200, 000 inhabitants of mountainous areas in the earthquake zone will need to be permanently resettled.
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