十分难以识别。
However, what we published is known material only. It is very difficult to identify unknown substances. There are tens of thousands of them.
我们发布这些东西只是对那些已知的东西，未知的东西你就很难弄了，未知的化学物质成千上万种。
Due to strong noise in vibration signals of rolling mills, it is very difficult to identify their fault location and to extract their feature.
由于轧机振动信号受到强烈的噪声干扰，给故障特征的有效识别和准确提取带来很大困难。
It is often very difficult to identify the structure of the automorphism group and the inner automorphism group of a group, and there is no general theory and method.
确定一个群的自同构群和内自同构群的结构往往十分困难，还没有一般性的理论及方法。
It is very difficult to identify the relationships between tangle events and accompanied mental disorders. There are often different descriptions of the same controversial conclusion.
纠纷事件与其伴发的精神障碍之间的因果关系是民事纠纷司法精神鉴定中的难点，鉴定结论往往存在争议，对同一结论的描述也有所不同。
As a rule, code compiled with full optimization can be difficult or impossible to debug, making it very difficult to identify bugs that may be causing the system to function incorrectly.
通常，经过完全优化的编译代码很难或者几乎不可能进行调试，这就加大了发现那些造成系统功能错误所在的难度。
Security experts are deploying a new worldwide system to identify Internet addresses that will make it very difficult to forge or spoof a Web site.
安全专家正在部署一个新的全球系统，该系统能鉴定互联网地址，使网站伪造或欺骗变得更加困难。
Security experts are deploying a new worldwide system to identify Internet addresses that will make it very difficult to forge or spoof a Web site.
安全专家正在部署一个新的全球系统，该系统能鉴定互联网地址，使网站伪造或欺骗变得更加困难。
People browsing the web tend to identify the language they speak, but determining their country code can sometimes be very difficult.
浏览Web的人易于标识他们所讲的语言，但确定其国家代码有时会很困难。
This technique seems to be very easy to be aware, but if this year has not been reviewed to identify, after all, unless the bank deposit journal check, it is difficult to find.
这种手法看起来非常容易被察觉，但如果本年内未曾复核查明，以后除非再全部检查银行存款日记账，否则很难发现。
It is very difficult to pigeonhole and identify Party, mass and administrative files.
高校党群、行政类文件材料的归档鉴定是比较难以把握的工作。
On the one hand, it is is very complex and difficult to identify fluid type of fracture reservoir because of its complex lithology, various reservoir types and heterogeneity.
一方面裂缝性储层具有岩性复杂、储集类型多样、物性变化大和非均质性强等特点，因而其测井解释和流体类型识别要复杂和困难得多。
Therefore, it is very difficult to have enough cells for a pathologist to conclusively identify.
因此，想要通过获得足够的细胞来进行病理学检查进而最终确诊，难度很大。
Aluminum material in air is very unstable easy to form with the naked eye, it is difficult to identify the oxide film.
铝质材料在空气中是极不稳定的，容易形成用肉眼难以识别的氧化膜。
We tried a more subdued look and the game was just boring to play, it was kind of difficult, it was hard to identify different types of creatures, it just didn't feel very fun.
我们尝试过柔和的、不怎么明亮的画风，但结果是游戏让人感到乏味，我们很难辨认不同类型的生物，这很无趣。
We tried a more subdued look and the game was just boring to play, it was kind of difficult, it was hard to identify different types of creatures, it just didn't feel very fun.
我们尝试过柔和的、不怎么明亮的画风，但结果是游戏让人感到乏味，我们很难辨认不同类型的生物，这很无趣。
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