主要原因

That has been a major source of heartburn for educators.

这是让教育工作者如坐针毡的主要原因。

One reason for the high price of tombs is the shortage of burial places in heavily populated cities such as Shanghai.

人口密集的申城无力提供足够的殡葬地是造成墓穴高价售卖的主要原因。

With the rise and fall of the hegemon based on un-equilibrium development in its power, the hegemonic system also developed cyclically.

霸权体系随霸权国家的兴衰而呈现出周期性的特点，导致霸权体系周期性变化的主要原因是各国在权力增长方面的不均衡性。

These phenomena are explained as follows thatduring the hydration of α-hemihydrate gypsum, cations have significance influence on theζpotential of α-hemihydrate gypsum, thereby the dispersed state and the dissolving ratesof α-hemihydrate gypsum are changed. But anions have slight influence because it isdifficult that anions enter the double-layer.

产生这一现象的主要原因是：在α半水石膏的水化硬化过程中，阳离子对α半水石膏的ζ电位产生较大影响，从而改变了α半水石膏颗粒的分散程度和溶解速度；而阴离子很难进入双电层，因此对水化过程的影响较小。

A numerical method to estimate hemolysis level in blood pump was presented and hemolysis indices were calculated.

给出了一种利用数值方法计算溶血指标的方法，并通过溶血指标的计算评价了血泵内的溶血程度，发现雷诺切应力是导致溶血的主要原因。

This is a major cause for subarachnoid hemorrhage.

这是侧支出血的主要原因。

The main cause of death was hemorrhagic shock.

失血性休克是死亡的主要原因。

BACKGROUND: Recently research demonstrated that primary non function of transplanted hepar is the main reason for early death after hepatic transplantation, so as to ischemia-reperfusion injury for poor graft function.

背景：近年来，随着器官移植的不断开展和深入研究，人们逐渐认识到供肝原发性无功能是引起肝移植患者早期死亡的主要原因，而缺血再灌注损伤是导致供肝功能不良的重要因素。

The questions involved are: concept of free particle,meaning of superposition principle,reason of assuming Hermitian operator,"interference of photons", identity principle and symmetrical postulat

讨论了量子力学中自由粒子的概念、叠加原理的意义、采用厄米算符的主要原因、"光子干涉"问题、全同性原理和对称化公设等几个问题。

Hypoxia induces the resistance of tumor cells[4];and the heterogeny of solid tumors result in the appearance of subpopulations of differentproliferative potency in the same tumor tissue, so that the target cells sensitive to cell cyclespecific drug are reduced.

目前有研究认为：实体瘤部分细胞缺氧和肿瘤组织的异质性可能是导致肿瘤对放疗和化疗产生耐受的主要原因之一，缺氧可以诱导肿瘤细胞对放疗和化疗的耐受性[4]，实体肿瘤的异质性可使同一瘤组织内具有不同增殖潜能的癌细胞亚群存在，导致细胞周期特异性化疗药物作用的靶细胞减少。

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。