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In this dissertation, the author has made some researches in the following aspects both theoretically and practically.

本文在自动文摘的理论和实践上做了以下几方面的工作。

Therefore, the topic of this dissertation has some significance both theoretically and practically.

因此，本文的选题有一定的理论价值和实际意义。

His suggestion works theoretically,but can not be carried out.

他的建议在理论上可以，但不能付诸实现。

All of these problems are needed to be further studied theoretically and practically.

这些均有待于更深层的理论和实践研究。

The second part is focused on the basis theoretically.

第二部分是文章的理论基础部分。

Therefore, it is significant theoretically and practically to study cultural tourism products development.

因此，研究文化旅游产品的开发，有着重要的理论意义和实践意义。

With the geometry, theory of errors and optimization principle used and the related national standard referred, a novel 3DLSA for evaluating the spatial straightness errors was proposed, so as to evaluate the spatial straightness errors effectively and to gain the error values with higher accuracy. Then,a mathematical model of the 3DLSA was deduced, true three-dimensional fitting of the spatial line was theoretically carried out.

为了有效地评定空间直线度误差，并得出正确度较高的误差值，运用几何学、误差理论和最优化原理，参照相关国家标准，提出了评定空间直线度误差的三维最小二乘算法（3DLSA），推导了3DLSA算法的数学模型，实现了空间直线的三维拟合。

In this paper, nanopowders of rare earth oxides and tungsten were prepared and 0-3 type nano-composit rare earth tungsten thermionic emission materials were fabricated with novel technics. The raw material selection, preparation technic parameter, structure, physical and chemical characteristic, the rare earth distribution and the emission behavior were studied. The influence between the active layer and the thermionic emission performance, rare earth elements diffusion and distribution along depth were investigated in detail. The surplus RE formation and the electron transfer were discussed in theoretically. The thermionic emission current density of the single surplus RE on the active layer was educed. We adopted "liquid-liquid mixing, freeze-drying and two stage-reduction" working step firstly to produce the RE-W nanopowders including La-W powder, Ce-W powder and Y-W powder.

本文采用细化显微组织的新工艺，制备了纳米稀土钨粉末和0-3型纳米复合稀土钨热电子发射材料，探讨研究其原料选择、制备工艺及参数、结构特征、物理和化学特性、稀土分布均匀性、以及热电子发射特性；系统研究了稀土元素的高温扩散情况、高温状态下活性层中稀土的纵向深度分布、以及表面活性物质和活性层厚度对热发射性能的作用；从理论上分析阐释了超额稀土的形成及其电子的传递过程；并从理论上推导了活性层中单个超额稀土的热电子发射电流密度。

Using piezoelectricity, thermoelectric couple and scanning electron microscope, the pressure peak, temperature rise and components variation of hydroyl-terminated polybutadiene solid propellant processed with high-pressure waterjet are measured experimentally. Ignition modes of HTPB solid propellant processed with high-pressure waterjet are theoretically analyzed.

利用压电传感器、热电偶和扫描电镜测量了丁羟固体推进剂在高压水射流作用下的压力峰值、温度和组分变化，分析了丁羟固体推进剂在高压水射流作用下的点火模式。

Theoretically, Terahertz CT could be used to map the complex refractive index distribution in target three\|dimensional space.

理论上 ，该技术可获得被测物在Terahertz波段的折射率和吸收率的三维分布。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。