主要原因

In these accident, the head injury, neck injury and curare injury accounts 70% of the sum dandification.

头颈部损伤是造成人员死亡的主要原因，而下肢创伤往往是交通事故中人员致残的主要因素。

Diptera, Hymenoptera and Araneae remained to be the main taxa in mixed stand, dominated by Diptera larvae accounting for more than 82% of the macrofauna collected (52% in Stand C).

在各类群中，主要以双翅目幼虫的多度和相对多度增加幅度较大，这种变化是降低整个群落均匀度的一个主要原因。

Through similar simulation test of block top-coal drawing, the influence of coal block size and block position in top coal on the recovery ratio and drawing manner is studied. It is found that the drawing manner has the different adaptation to the top coal which has different block distribution. The caving capacity is mainly decided by the block size. The top-coal which has layer difference of block with the same size has different recovery ratio. It is shown, that, to the given top-coal blocks, the recovery ratio of uniformly mixed blocks is maximal in the manner of drawing at interval of one support.

研究表明，顶煤块体大小是影响顶煤回收效果的主要因素，在顶煤块径一定的条件下，块体层位分布不同是造成顶煤回收率差异的主要原因，研究表明各级块度均匀混合时顶煤回收效果最好，块度从下向上增大分布次之，大块为中位顶煤时回收效果最差；各种放煤方式的适应性不同，各级块度均匀混合的顶煤适合用间隔放煤；块度从下向上增大适合用顺序放煤；大块在顶煤中位分布时，中硬煤以下适合用间隔放煤，硬煤应采用顺序放煤方式。

Portal hypertensive enteropathy,whose fundamental pathologic change is a vasculopathy characterized histopathologically by mucosal and submucosal vessel dilatation,oedema and congestion,mainly results from a combination of increased intrahepatic vascular resistance and increased blood flow through the portal venous system.

肝硬化门静脉高压性肠病(portal hypertensive enteropathy，PHE)的2大主要发病机制是肝内门脉血流阻力增加和流经门脉血流增多。PHE的基本特征是组织病理学上的特征性血管病变。临床表现无特异性，但却是下消化道出血的主要原因。

Engineering experience and research results indicate that this damage is due to the extortionate air voids of bitumen mixtures.

在高速公路沥青路面中，水损坏是沥青路面的主要病害之一，也是导致沥青路面早期破坏的主要原因之一。

To contribute to the progress of agricultural technology, China has made remarkable achievements in agricultural development. There is a historic change in the supply of major agricultural products from a long-term shortage to surplus in foison year. The grain output increased from 113.18 million tons in 1949 to 484.022 million tons in 2005, and the annual growth rate is 5.85%. Technological advances have made tremendous contributions to Chinas grain development.

在农业技术的推动下，我国农业发展取得了举世瞩目的成就，主要农产品供给实现了长期短缺向丰年有余的历史性转变，粮食产量从1949年的11318万吨增长为2005年的48402.2万吨，年均增长速度5.85％，技术进步带来的单产水平的提高是我国粮食产量的不断增长的主要原因，技术进步为我国粮食发展作出了巨大贡献。

The foreword is to illustrate the cause of writing and to study main problems .

引言。简要说明了写作的主要原因和探讨的主要问题。

Decreasing the gravidity and the times of curettage、avoiding delivery out of hospital and better supervision of antenatal care in the community studied are recommended to reduce obstetric hemorrhagic shock cases.

结果：产科失血性休克的发生率为0.65%，胎盘因素是失血性休克的主要原因；主要的危险因素是多次妊娠和流产、院外分娩及重度子痫前期。产科失血性休克导致的子宫切除率为17.6%。

Analysis is done to the impact of ring s and travellers on yarn breakage and hairiness.

分析了钢领、钢丝圈对成纱毛羽和细纱断头的影响，指出了钢领、钢丝圈造成细纱毛羽的4点主要原因和造成细纱断头的7种主要因素。

A main reason why so many in the West have taken part in the protests against China is ideological: Tibetan Buddhism, deftly spun by the Dalai Lama, is a major point of reference of the New Age hedonist spirituality that is becoming the predominant form of ideology today.

为什么有这么多的西方国家参加到抗议中国的行动中来，有一个主要原因就是意识形态：由达赖喇嘛鼓吹的西藏佛教已经成了新时代享乐主义者的精神依托，在当今的意识形态中占了主要地位。

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。