The research status and existing problems of the studies on Horqin sandy land and the actual situation of Horqin sandy land were summarized.
综述了科尔沁沙地沙漠化研究的现状和存在的问题，以及科尔沁沙地的实际情况，并提出了今后应进一步加强研究的领域。
Research status and existing problems concerning dryness measurement in steam-liquid two phase flow is presented, together with the discussion on development tendency.
本文介绍了气液双相流体干度测量的研究状况及存在的问题，讨论了这一领域研究工作的发展趋势。并提出了两种基于反问题想法的间接测量方法。
The part of introduction presents the meaning of this paper, the current research status and existing problems in this field, and the theories and methods applied by the author.
作者首先在引言部分中介绍了本文的选题意义、研究现状及问题、作者应用到的理论和研究方法以及作者的思路。
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