主要原因

In this dissertation ,the author draws a conclusion that reasons of the surviving of The Celestial Empire are two :(1) China was admitted as a nation—state by the foreign powers in china ;(2) China won bigger room maneuvered which was due to the great efforts made by the Officers of the Qing Dynasty in the dangerous situation of the sharp international competition .

认为"中华帝国"的完整性与连续性的形成，主要原因包括：其一，列强在华力量均势的形成，使"中国"作为一个国家实体得到认可；其二，自晚清以来的中国政府、外交官员对均势外交、弱国外交的运用，为"中国"在国际竞争的险恶环境中创造了较大的回旋空间。

Two of these groups of micro organisms, streptococci and staphylococci, are generally the main cause of cellulitis.

2这些群体的微有机体，链球菌和葡萄球菌，一般的主要原因，蜂窝组织炎。

Mechanical compaction and cementation were the main factor caused the loss of primary pores.

压实作用和胶结作用是造成本区储层物性降低的主要原因。

The acceleration of cementite decomposition and the transformation of ferrite result from the increase of graphite nucleation rate by electropulsing.

脉冲电流处理后石墨形核率的增加是加速渗碳体分解和铁素体转变的主要原因。

Here are the main reasons businesses go with Centrex as opposed to going with a stand- alone telephone system

企业愿意使用Centrex 服务而不再使用单一的电话系统，有以下主要原因

The main reason is: 16,17 century ...

其主要原因是：16、17世纪。。。

The different head loss pattern was considered as the reason of that up-flow BAF had a longer operation time than down-flow BAF. Carbonate gravel (3～5mm) filter had a larger porosity and consequently had a longer operation time than that of ceramist filter.

试验中发现，上向流曝气生物滤池运行过程中水头损失呈近线性变化，而下向流曝气生物滤池的水头损失则在接近过滤终点时呈明显的指数式突跃增加，这是导致下向流曝气生物滤池运行周期比较短、反冲洗比较容易的主要原因。

The main reason for the difference of ceria solubility in two ceramics sintered from two kinds of powders is attributed to the different stabilizing mode.

稳定剂进入微结构方式的不同是两种工艺中CeO〓在晶粒中固溶量随晶粒尺寸变化出现差异的主要原因。

Objective To analyse the possible factors of dental implantation s uc cess and failure.

目的：分析93年以来人工种值义齿成败的主要原因。

The presence of REE tetrad effects in apatites and whole rocks of S-type granites has been reported by Sha and Chappell (1999) and Zhao et al.(1999), respectively. The REE tetrad effect in minerals, such as apatite, spessartite, beryl, alkali feldspar and spodumene, from all zones of Altay No. 3 pegmatite has been found remarkable, and the fractionations among isovalent incompatible elements in these minerals are also significant. This paper puts forward that the REE tetrad effect is one of the basic features of peraluminous melts and the origin of REE tetrad effect might be probably related to some processes prior to the formation of pegmatite magma. The immiscibile liquid separation between silicate melt and hydrosaline melt may be responsible for it.

由于阿尔泰3号伟晶岩脉各带磷灰石以及与其共生的石榴石、绿柱石、碱性长石、锂辉石矿物均存在明显的稀土"四重效应"以及相同电价、相似离子半径的不相容元素间存在显著的分异，并结合最近赵振华等(1999)和Sha and Chappell(1999)报道S型花岗岩全岩和单矿物(磷灰石、独居石、长石、黄玉等)均存在稀土"四重效应"这一现象，本文研究提出，稀土"四重效应"是富挥发分过铝质岩浆体系的一个基本特征，其机制既不可能由含稀土的副矿物早期结晶引起残余熔体相中REE含量变化的结果，也不能定性地归因于流体相与熔体相相互作用过程中稀土元素在流体/熔体之间分异的结果，而很可能与伟晶岩岩浆形成之前某些过程密切相关，S型花岗岩岩浆在液相线以上存在硅酸盐熔体与高盐熔体的不混溶液相分离有可能是过铝质岩浆体系产生稀土"四重效应"的主要原因。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。