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This dissertation has selected one of the most important periods in the Shi'a history in Iran, which is from the Mongol invasion to the establishment of the Safavids, and the announcement Twelver Shiism as the official religion in Iran, in order to find out the reasons why the Iranians have chosen the Shi'a belief.

本文选取了什叶派在伊朗历史发展的关键阶段之一，即从蒙古人入侵伊朗到萨法维王朝建立，并确立什叶派中的十二伊玛目派教义为国教为止，力图揭示伊朗人选择什叶派为国教的根本原因。

During periods of elevation the area of the land and of the adjoining shoal parts of the sea will be increased.

在上升的时期，陆地和附近浅滩的面积都将扩大。

He is suffering from shortness of breath and periods of continuous pain.

他呼吸短促，还有间歇性的持续疼痛。

This paper simpiy discusses the developing course of peace Redemption theory of Marxism in deferent countries and Ristorical Periods. The discusses are of realistic significancy for the reform and open goingon our country.

本文简要论述了马克思主义"和平赎买"理论在不同国家、不同历史时期的发展过程，对于我国正在的改革开放，有一定的现实意义。

Nutrient accumulation and distribution of different organs in 6 silage maize cultivars were measured in different harvest periods.

以6个青贮玉米品种为材料，对不同收获时期营养成分含量与积累量的变化进行研究。

Silurian The period, some440-405 million years ago, between the Ordovician and the Devonian periods of the Paleozoic.

志留纪：四亿四千万到四亿零五百万年前的一个地质时期。

The early Palaeozoic black shales widely distributed in southern China, which were majorly formed in followimg periods: Hetang period of Early Cambrian, Miaopu period of Middle Ordovision, Wufeng period of Late Ordonision and Longmaxi period of Silurian.

本文通过对四期缺氧期间黑色页岩的分布、沉积特征及古构造、古地理背景的研究，指出华南缺氧事件和黑色页岩的形成可以由地内或地外的多种因素引起。

It is divided into six main periods: the Cambrian , Ordovician, Silurian, Devonian, Carboniferous ,and Permian.

分为六个主要的时期：寒武纪、奥陶纪、志留纪、泥盆纪、石炭纪和二叠纪。

Moreover, the megafossils suggest that terrestrial life appeared and diversified explosively near the boundary between the Silurian and the Devonian periods, a little more than 400 million years ago.

而且，巨化石也表明，在四亿多年前的志留纪和盆泥纪之间的期间（在志留纪和盆泥纪之间的期间，即四亿多年前），陆生生命已经出现，种类也急剧增加。

Analytical approximate periods and periodic solutions to large amplitude oscillation of a simple pendulum are constructed using a new method.

构造了单摆大振幅振动的高精度解析逼近周期和周期解。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。