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是必不可少
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  is necessary
     Atomicity is necessary for reliable and secure electronic commerce transaction.
     原子性对于可靠、安全的电子商务交易是必不可少的,是参与交易各方利益的重要保证.
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     It is necessary to detect GMO in food either GMO labeling or GMO and non-GMO material transportation.
     不论是对GMO食品贴标签 ,或是对GMO与非GMO原料的分别输送 ,GMO原料和食品的检测技术是必不可少的。
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     Therefore, it is necessary to keep HRCT as a routine scan after SCT for the diagnosis of tuberculoma.
     因此 ,HRCT作为SCT扫描的补充手段对于一些结核瘤的诊断是必不可少的。
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     Therefore , moreenvironmental education is necessary for increasing people抯 environmentalconsciousness and better understanding environment and environmental problem sothat the acts of human being could be harmonious to environment.
     因此,要提高人们的环境意识,正确认识环境和环境问题,培养个人或集体为解决现实环境问题和防止发生新的环境问题,所需的知识、技能、态度、意志和实践能力等,使人们的行为与环境相和谐,加强环境教育是必不可少的。
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     Supporting Platform of Network Teaching plays an important part in Internet-based education. It is necessary for network teaching, intelligent auto answer and virtual laboratory etc.
     支持网上教学的网络教学支撑平台在网络远程教学系统中扮演着重要的角色,对于网上教学、网上答疑、虚拟实验室、网上讨论和协同工作、网上实时考试、课件开发及管理和教学教务管理都是必不可少的。
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  is essential
     Security is essential to a successful J2EE application.
     对于一个成功的J2EE应用来说安全是必不可少的。
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     However, as a developing country, in the process of developing the modern rule of law, the Chinese government’s political authority is essential.
     但是,中国作为一个发展中国家,在走上现代法治的过程中,政府的政治权威又是必不可少的。
短句来源
     In processing, recognition, visualization and computer graphics of 3D images, such as LSCM, CT and MRI images, 3D object construction is essential.
     在三维图像 ,例如LSCM ,CT和MRI图像的处理、识别、可视化和计算机绘图中 ,三维物体的重建是必不可少的 .
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     As the application of timber structure is expanded progressively, Modern Timber Architecture Compound with Steel will go on the frontal stage in timber architecture design used in the large-scale public building , the study on its theory is essential too.
     随着木结构的应用领域逐步扩大,可广泛应用于大型公共建筑中的现代钢木复合结构建筑也必将逐步走上木结构建筑创作的前沿,对其理论的研究也是必不可少
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     The knowledge about microwave technology is essential to the higher vocational college students whose major have a relation to it.
     当前微波技术应用广泛,微波技术方面的知识对于相关专业高职学生来说,是必不可少的。
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  “是必不可少”译为未确定词的双语例句
     Macro mineral such as Na, P, K, CaCl, Mg and S is absolutely necessarily for ruminants (Underwood 1981).
     常量元素Na、P、K、CaCl、Mg和S对反刍动物是必不可少的 (Underwood 1981)。
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     3 kinds of 1H-1,5-benzodiazepine derivatives were synthesized by reaction of o-phenylenediamine and ketones using NiCl2 6H2O or InCl3 4H2O as a catalyst, The title compounds were characterized by 1H NMR, IR spectra.
     通过选用经济、易得的NiCl_2·6H_2O或InCl_3·4H_2O做催化剂,使邻苯二胺与酮环化缩合,合成了三种1H-1,5-苯并二嗪衍生物。 对照实验表明催化剂是必不可少的,其结构经~1HNMR、IR得到表征。
短句来源
     In ""N_1 的 N_2" structure of Chinese, "的" can be omitted, that will not have influence on semantic meaning. "
     汉语“N_1的N_2”中的“的”可以省略,并且不影响语义,“的”这种组合手段不是必不可少的。
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     CD21also expresses on the surface of follicular dendritic cells,which mediates the long-term maintenance of antigens and is indispensable for maintaining the memory of B cells.
     CD21也表达于滤泡树突状细胞,介导抗原的长期保留,这对维持记忆B细胞是必不可少的。
短句来源
     Interestingly,the activity of the promoter containing the deletion of the E box at +44 site did not show any changes in A549 and LoVo cells,but was 3-fold decreased in Hela cells,indicating that the role of this E box (+44) depends on cell type.
     x对启动子活性是必不可少的:有趣的是,位于+44位点的 E bOX缺失(凸MyCZ)对启动子在 A549和 LOVo细胞中的转录活性几乎没有影响,然而在Hela细胞中却降低了3倍,表明此Eb。
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  is necessary
In the spirit of work of Kerman and Sawyer, a condition is given that is necessary and sufficient for the Fourier transform norm inequality
      
It is necessary to modify the structure of digital control systems and develop new control algorithms, which is done in this paper.
      
It is necessary to test for varying dispersion in generalized nonlinear models.
      
It is necessary to select the catalyst with proper Pt loading when the anode of a direct-methanol fuel cell is prepared.
      
Therefore, it is necessary to implement automatic mitigation which can detect worm and drop its packet.
      
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  is essential
To establish a relationship between activity and structural descriptors of BABQ compounds, it is essential to develop a regression or an input-output model.
      
High β-glucosidase activity is essential for deep pulp hydrolysis.
      
Known and new methods for defining a resolving function, which is essential for applying these conditions, are described.
      
According to the published data, the odor of the secretory substance of the circumanal hepatoid glands is essential for communication in wolves and dogs.
      
We identified a segment of gene expression that is essential for neoplasia.
      
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In this paper a single channel duplex carrier telephone for colliery trolley locomo-tives is introduced. The following are discussed at some length: the effects and technical characters of the system; discussion about simplex or duplex working; circuit design and choice of elements; notes concerning input circuit; use of auto-gain con-trol; the treatment of high frequency.Authors consider that duplex working is more suitable, band-pass filter should be applied in the input circuit and the auto-gain control is...

In this paper a single channel duplex carrier telephone for colliery trolley locomo-tives is introduced. The following are discussed at some length: the effects and technical characters of the system; discussion about simplex or duplex working; circuit design and choice of elements; notes concerning input circuit; use of auto-gain con-trol; the treatment of high frequency.Authors consider that duplex working is more suitable, band-pass filter should be applied in the input circuit and the auto-gain control is indispensable for the colliery trolleyphones.

本文介绍一种矿井架线电机车用的单路双工载波电话.文中较详细地讨论了载波电话的使用效果、技术性能、单双工问题、电路和元件选择、输入回路、自动增益控制和高频处理等问题. 作者认为对矿井架线电机车载波电话来说,双工通讯较合宜;输入回路应采用带通滤波器;自动增益控制是必不可少的.

:

随着摄影测量解析法的迅速发展,立体坐标量测仪上的自动读数设备已成为必不可少的部件。本文讨论了记录设备中的几个主要问题,并提出二个方案。所设计的读数设备不但可以与新设计的立体坐标量测仪连成一体,而且可以附加在已有的立体坐标量测仪上,不会破坏原有仪器结构和损害仪器精度。读数时间为3秒,记录时间为30秒。读数精度为±3μ。并配置有打印记录和五单位编码穿孔等设备。

This paper describes a mothod of Oombining theoretical Calculation baaed on the finite element with mechanical impedance testing [techniques.]Using this method we have determined [dynamic bending elastic modulus E for helicopter fiberglass tail rotor and the variation of modulus K with the frequency and temperature. These data are indispensable original parameters in helicopter tail rotor designs at present. This paper also describes a mothod of estimating modal damping coefficient 77 by using the acceleration...

This paper describes a mothod of Oombining theoretical Calculation baaed on the finite element with mechanical impedance testing [techniques.]Using this method we have determined [dynamic bending elastic modulus E for helicopter fiberglass tail rotor and the variation of modulus K with the frequency and temperature. These data are indispensable original parameters in helicopter tail rotor designs at present. This paper also describes a mothod of estimating modal damping coefficient 77 by using the acceleration mobility spectrogram measured.

本文介绍了利用有限元的理论计算与机械阻抗测试技术相结合的方法,确定直升机玻璃钢尾桨的动态弯曲弹性模量E及E随频率和温度的变化关系。这些数据是目前直升机尾桨设计必不可少的原始参数。还介绍了利用测量得到的加速度导纳谱图确定模态阻尼系数η的方法。

 
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