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Although it was as obvious to Aristotle as it is to us now that birds from northern latitudes migrate to the tropics in order to escape an ice-bound winter, precisely how they manage to make their way from one hemisphere to the other remains one of the great puzzles of the natural world.

北纬地区的鸟儿迁移到赤道地区是为了逃避冰封的冬天,这是当年亚里士多德知道,我们现在也同样清楚的事实;尽管如此,鸟儿是怎样从一个半球迁移到另一个半球的,至今依然是自然世界的一大的疑谜。

Though the contents of trace elements in coal are very low, environment pollution caused by trace elements has been an inarguable fact At present, more researches lay particular stress on the occurrence during coal combustion, and several about coal gasification. The researches about trace elements in fluidized bed gasification are much less, saying nothing of pressurized fluidized bed gasification.

目前国内外研究更多的偏重于燃煤过程,对煤气化过程中微量元素迁移规律的研究较少,关于流化床气化炉型的文献更少,涉及加压煤气化过程中微量元素迁移规律的研究几乎没有。

In this aspect, researchers in China have done a great deal of work, however since interprovincial migration is a reaction to differences among provinces, different periods of time will have their own influences on the migration characteristics.

省际人口迁移作为一类长距离的迁移,也成为了学者们关注的一个重点。在这方面我国学者做出大量的研究工作。

So inter-area migration becomes the leading pattern and main composing in interprovincial migration.

这使跨地带人口迁移成为省际人口迁移的主要模式和重要组成部分。

Standard thermodynamic functions of transfer of naphthalene from water to H 2O isopropyl alcohol mixtures have been determined.

研究了萘从水到H2O-异丙醇混合溶剂中的迁移变化,表明萘的迁移随异丙醇摩尔分数x的增加呈复杂的下降趋势。

According to Huygens, light is a wave, a transference of energy and not of substance.

按照惠更斯的说法,光是一种波,它是能的迁移而不是物质的迁移

This paper reviews the status of research on the ion migration in solids by meansof electron microprobe techniqueconducted at our institute.

本文综述了我们用 EPMA 和 SEM 技术研究固体中的离子迁移所取得的结果。主要内容包括:(1)测定在电子束轰击下固体中可迁移离子的种类和组成的变化。

This paper, first, summarizes the research on the population mig...

本文首先总结了国内外人口迁移研究进展状况,介绍了人口迁移研究的一些相关理论。

The mobility value used is that of the minority carrier.

所采用的迁移率值都是少子迁移率。

The onset crystallization temperature of a-Si is effectively lowered due to the formation of Ni silicide, and the crystallization depends strongly on the migration of NiSi〓 precipitates.

对晶化的机理研究表明,a-Si在低温下的晶化是由于形成了Ni的硅化物,其晶化的发生是由于NiSi〓的迁移,其迁移的驱动力是由亚稳态的a-Si转变为c-Si。

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在对危险的南部地区访问时,他斥责什叶派民兵领导人对中央集权的挑衅行为。

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