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。
The management of database connection is a difficult point in the development of RES(Remote Education System) based on JDBC in that it is one of the main factors which can resolve the features of RES.
在基于JDBC的远程教育系统的应用开发中，数据库连接的管理是一个难点，因为它是决定该系统应用性能的一个重要因素。
It is difficult to grasp the new evidence on retrial uniformly, on the whole, the main point is restrict it strictly.
对再审新的证据的统一把握是一个较有难度的问题，总体上来说，不能脱离对其从严掌控的主线。
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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