Summarize the focal property and aberration correcting ability of VLS plane grating.

对平面变栅距光栅的聚焦特性和像差校正原理进行了较全面的综述。

As a typical broadband network application, VLS-VOD has attracted large Numbers of service providers and users.

超大规模VOD应用作为宽带网络中的典型应用，对服务提供商和用户都有强烈的吸引力。

Make the ruling experiments for VLS grating using the phase scanning method. Analyze the ruling error primarily.

采用相位扫描方法进行了变栅距光栅的刻划实验，并对刻划误差进行了初步的分析。

This study aims to explore whether there is any relationship between the use of vocabulary learning strategies (VLS) and L2 mental lexicon.

影响心理词汇组织结构的因素有词频、学习者的语言水平以及对具体每一个单词的熟悉程度。

The control system of the VLS gratings ruling engine is given also and a ruling experiment of the VLS gratings is made to examine the novel method.

提出了采用相位扫描方法加工变栅距（VLS）光栅的基本原理，给出了VLS光栅刻划机的控制系统，并通过刻划实验对这一新方法进行了验证。

What we have done and what we will do next will advance the VLS-VOD application, and provide a good theoretical and practical foundation for VLS-VOD research.

本文的研究工作将会推动超大规模VOD应用早日成熟，并为进一步的研究工作提供良好的理论和实践基础。

On the basis of Fraunhofer diffraction theory, the diffraction patterns of a Varied Line-space (VLS) grating were obtained for incidence beam in parallel and uniform.

基于夫琅禾费衍射理论，推导了平行光入射变栅距光栅后衍射光强的角度分布。