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This paper deals with the advance in the study of terrestrial Permian-Triassic boundary. At first, some index TPTB sections and their research backgrounds are introduced. Then, the research status on the synthesis of the TPTB, including biostratigraphy, eventostratigraphy, isotopic dating, magnetostratigraphy and sequence stratigraphy etc., is analyzed. Finally, the existing problems and the next research directions about the TPTB study are assessed.

着重介绍了几个目前陆相二叠系－三叠系界线研究的重点剖面及其生物地层学研究进展；分析了陆相二叠系－三叠系界线综合地层学研究现状，包括生物地层学、事件地层学、同位素年代学、磁性地层学和层序地层学等；剖析了陆相二叠系－三叠系界线地层学研究中存在的问题及进一步的研究方向。

Selenium is one of the most important metalloid element existing in biotic environment.

硒是生物环境中存在的一种重要的类金属元素。

The biotope landscape refers to protecting the existing habitat for animals and plants, restoring the natural environment that was destroyed, and creating new biology environment to life.

生物生境是指保护、维护现有的动植物栖息地，恢复受到破坏的自然环境，创造新的生物生息环境。

The existing enterprises in China, which are no more than twenties years old, suffer all kinds of birth pangs consisting of the reformation of system and the conversion of economy.

中国真正意义上的企业存在的时间不过是改革开放后的短短二十几年，在这一特定历史阶段里，中国企业承受了体制改革，经济转轨等带来的种种阵痛。

Since these questions cannot be satisfactorily explained by existing researches, it is necessary to study personality bisexuality from other angles of view.

对这些问题，已有研究似乎还不能很好的回答。

This text has introduced the recovery course of bismuth recovery, problems existing and the methods of settlement.

介绍了铅阳极泥中铋的回收过程，存在的问题及解决的办法。

They should also be particularly sensitive if they have existing health issues. For instance, those with heart conditions should be careful about supplements that act as stimulants, which can involve ingredients such as bitter orange and guarana, in addition to caffeine.

患有疾病的人群服用保健品时要尤其注意，比如说，有心脏病的人在服用有兴奋作用的保健品时要当心，因为里头不但有咖啡因成份，还可能含有枳壳和瓜拉那等物质。

But, form of these two kinds of organizations is existing a few blemish.

但是 ，这两种组织形式都存在着一些缺陷。

This article unified the customer personalization demand the characteristic, the existence question as well as the production and the dispatch production management system has done the preliminary research, the union case analysis based on the customer personalization demand production and the dispatch to the economic development function, narrated and commented the existing some production scheduling method, proposed that the utilization blending inheritance algorithm solution based on the customer personalization demand's production scheduling question's methodology, has simultaneously established take the customer demand as the guidance production scheduling architecture.

本文结合顾客个性化需求的特点、存在的问题以及生产与调度生产管理系统做了初步的研究，结合案例分析基于顾客个性化需求的生产与调度对经济发展的作用，评述已有的一些生产调度方法，提出运用混合遗传算法解决基于顾客个性化需求的生产调度问题的方法论，同时建立了以顾客需求为导向的生产调度体系结构。

The commercial-scale test shows that the oxygen-enriched air blowing has opened up a new way to higher output of blister copper under the existing conditions.

工业试验表明，富氧吹炼开辟了一条在现有条件下提高粗铜产量的新途径。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。