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Present value is the value on a given date of a future payment or series of future payments, discounted to reflect the time value of money and other factors such as investment risk .

现值是在给定的利率水平下，未来的资金折现到现在时刻的价值，是资金时间价值的逆过程。

This article analyses the Vector Space Model based on Algebra, and expands the model: expresses the index terms with minterm in order to reflect the relationship between terms, uses singular value decomposition to present the semantic structure of documents.

本文分析了代数理论的向量空间模型，并对该模型进行了扩展：用最小项标引词以反映词与词之间的关系，用奇异值分解来捕捉文献的语义结构；最后对这三种模型进行了比较。

Whether the simulation results can veritably reflect the performances of an actual or assumed product depends mainly on the correction of its model.

仿真结果能否真实地反映实际的或设想的产品系统性能，首先取决于其建立的模型是否准确。

There are many works on the theme of starvation in Chinese contemporary literature,which reflect the true life veritably,directly facing to tribulation and furthest reverting the facts of history.

饥饿，在中国的历史上，不仅仅是一种普遍的生理现象，它更是中国人历史性的梦魇，深刻地影响着中国社会的方方面面，影响着中国人的生存方式和生存状态。

The effect in the range from 1% to 4% of graphite, and several thickness of foamglass on reflect effectiveness were studied. As a result of our experiment, we concluded that the RE of foamglass with graphite as vesicant is about -5～-13dB in the range of 8～18GHZ.

实验结果表明，用石墨作发泡剂的泡沫玻璃在8~18GHZ频率范围内具有－5~－13dB的吸波效果，能满足地面目标反雷达伪装的要求。

Rotary viscosimeter is employed to reflect the effect of the composition, shear, temperature and salt concentration on viscosity of the modified polyacrylamide was studied in different synthesis approaches.

为了增强聚丙烯酰胺的增粘性能，提高其抗剪切、抗温和抗盐性，使用实验室自制的疏水单体、丙烯酰胺和离子型单体，通过3种不同的聚合方法进行自由基共聚合。

The multi-attributes and multi-parameters of 3D seismic data is studied through detailed processing and interpretation of 3D seismic data based on seismic model inversion and seismic reflector features recognition ,the relationship between reservoir and seismic attribute parameter is determined , and reservoir forestation is done , the response feature and three types recognition model for carbonate reservoir in seismic reflect cross-section are established, deepen the understanding of distributions of fracture and vug within this reservoir.

在地震模型正演和地震波形分析的基础上，通过对区内三维地震资料的精细处理解释，开展了地震资料的多属性、多参数综合分析，确定了储层和地震属性参数间的关系，开展储层预测及评价研究，总结碳酸盐岩缝洞发育带的地震响应特征，建立了3类缝洞碳酸盐岩储层识别模式，深化了对裂缝、溶洞发育带空间展布规律的认识。

But the rigid body limit equilibrium method can not reflect the process of progressive instability and mechanical mechanism on failure for rock mass while the nonlinear finite element method is difficult to solve the displacement discontinuity of weak structural plane.

重力坝的深层抗滑稳定分析多采用刚体极限平衡分析方法和非线性有限元法，但通常的刚体极限平衡法不能反映坝基岩体渐近失稳过程和破坏的力学机制，非线性有限元法则难以解决坝基中软弱结构面位移不连续问题。

As is low porosity and low permeability gas reservoir in Daniudi Gasfield and the influence of the drilling and geologic conditions on it, the total hydrocarbon values in wellsite gas logging could not accurately reflect reservoir gas bearing properties, and the interpretation and evaluation accuracy was decreased.

大牛地气田为低孔、低渗油气藏，由于钻井与地质条件等因素的影响，现场录井随钻全烃值不能准确反映储集层的含气性，降低了解释评价的准确性。

The beam is reflect ed back differently according to the amount of water on the windscreen.

风挡玻璃上雨水的多少会对此光束形成不同程度的反射。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。