The main minerals are olivine, pyroxene, kamacite and taenite, but common point of various stone iron meteorite seldom, so it is difficult to induce class.
主要矿物有橄榄石、各种辉石、铁纹石和镍纹石，不过各种石铁陨石之共同点很少，所以很难归纳成类。
This paper introduces video concept, main apply domain, main characteristic, classification and technological difficult point of video watermark at first.
本文首先介绍了视频水印的概念、主要应用领域、主要特征、分类以及视频水印研究的技术难点。
Syntax tagging is the main and most difficult point of corpus tagging, and should be based on syntax theory.
句法标注是语料标注的重点、难点所在，必须以一定的句法理论为基础。
Syntax tagging is the main and most difficult point of corpus tagging, and should be based on syntax theory.
句法标注是语料标注的重点、难点所在，必须以一定的句法理论为基础。
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