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。

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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。

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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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The main sticking point is a collection of state and federal laws that make it difficult for car companies to terminate a dealer franchise.

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