i'd like to send an express telegram.

many gathered on the mountain and spent the day building snowmen, having snowball fights and holding tobogganing races

许多人纷纷聚集在山上，花整天的时间一起堆雪人、打雪仗、举行滑雪比赛。

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our favourite amusement during that winter was tobogganing.

我们最喜爱的冬季娱乐活动是滑雪橇。

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in the distance i could see the children tobogganing down the hill.

我远远看见孩子们正坐着平底雪橇从山上滑下来。

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although skiing is regarded as the prime winter sport, tobogganing and skating have an even longer history in switzerland and are widely practised.

尽管滑雪是冬季的首要运动，但平底雪橇和滑冰在瑞士的历史更久，而且范围更广。

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other options include tobogganing, fireworks and horse-drawn carriage rides through the capital vaduz.

其他选择还包括乘坐平底雪橇、放烟花或坐马车游览首都瓦杜兹。

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a repair process study has been conducted to delay the occurrence and propagation of fatigue cracks which are likely to exist in the welded area around the air chamber union on the wall of accumulator fuel tank in a certain-type aircraft to prolong the service life of the tank.

针对某型飞机蓄压油箱气腔管嘴处焊接部位易产生疲劳裂纹的问题，对超期蓄压油箱采用局部修补方案，以便延缓裂纹的产生和扩展，达到延长使用寿命的目的。

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analysis of corrosion on local position of supporting beam of accumulator tank in decompression tower

减压塔三线集油箱支撑梁局部产生腐蚀原因

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addendum envelope notched like a saw with teeth pointing toward the apex.

（指螺旋齿轮的）齿顶包络面锯齿状的像牙齿顶端一样的。

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in addition, it was also convenient to administrate drugs directly into the pulmonary circulation or to collect blood samples from pulmonary artery or left atrium for biochemical tests, providing a relevant means for studying pathologic physiology of the pulmonary circulation and the metabolism of lungs.

可通过导管向肺动脉内给药或自肺动脉、左心房采集血样，为研究肺循环的病理生理及肺代谢功能提供了条件。

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based on all these, the author of this article proposes the hypotheses of reentry between pulmonary vein and left atrium, and expound its rationale and clinical significance.

基于此，作者提出心房颤动维持的肺静脉-左心房折返假说，并阐述了其理论基础与意义。

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msct is helpful for anatomy assessment the relation of pulmonary vein and left atrium, clinical operation and radiofrequency catheter ablation on treatment of atrial fibrillation.

螺旋CT有助于肺静脉与左心房的关系的解剖学评估，对临床手术及房颤射频消融治疗有重要指导价值。

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a method of chronic intubation into pulmonary artery and left atrium for measuring pressure was introduced.

本文报告狗肺动脉和左心房的插管方法。

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the influence of persistent rapid atrial pacing on the levels of connexin 43 and type ⅲ collagen in pulmonary vein and atrium in a canine model

持续快速心房起搏对犬肺静脉及心房组织连接蛋白43和Ⅲ型胶原的影响

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maintenance mechanism of atrial fibrillation& "a pulmonary vein-left atrium reentry" hypothesis

心房颤动维持机制的新观点&肺静脉-左心房折返假说

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pulmonary artery-left atrium pumpless lung assist for acute lung injury in piglets

肺动脉&左心房无泵肺辅助治疗急性肺损伤的研究

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with deformation, the nucleation of ferrite is thought to be at deformation bands beside grain boundary. therefore, boundary area is replaced by effective boundary area as nucleation sites.

在变形条件下，铁素体除了在奥氏体晶界形核外，还在变形带等内部缺陷处形核，因此以有效晶界面积代替简单晶粒拉长的晶界面积。

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and with the increase of the plastic deformation, the inclined direction of the deformation bands takes place a symmetry change.

实验还观察到随着塑性变形量的增加，变形带的倾斜方向会发生对称迁移现象。

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by using digital speckle shearography, the behavior of out-plane deformation of the plc bands is studied.

首次将剪切散斑干涉法引入到PLC效应的研究中，观察了PLC带的离面变形行为。

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the results show that the subgrain structures of the ferrite-strip along the drawing direction are formed in the deformation bands of steel. the { 110} crystal planes are the slip planes of ferrite subgrain-strip, and the dense dislocations exist in the subgrains.

结果表明：在变形带中，铁素体沿平行于剪切应力方向形成条带状亚晶，{110}晶面为变形条带状亚晶的滑移面，条带状亚晶内存在高密度位错；

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the plastic strain is carried either by shear bands only, or by shear bands and deformation bands, in the specimens fatigued under strain control. consequently, fatigue cracks nucleated either along shear bands or along deformation bands.

在应变控制疲劳样品中，塑性变形既可由剪切带来承担，也可以由剪切带和形变带共同承担，进而疲劳裂纹分别沿剪切带或形变带萌生。

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