腔静脉与心房窦的

Puncture into Attain long sheath of CS through left infraclavicular vein, guided by CS pipe, take sheath into CS, make reverse contrast of heart vein with Attain saccule contrast pipe, put the left ventricle electric pole into the vein through sheath, then bring it into right ventricle apex and right cardiac ear through the electric pole of right ventricle and atrium, connect it with 3-cavity pulse generator, which is buried under left chest skin.

方法］经左锁骨下静脉穿刺送入Attain冠状静脉窦长鞘，在CS导管的导引下，将鞘送人CS，用Attain球囊造影导管进行心脏静脉逆行造影，将左心室电极经长鞘放入选择的静脉，送人右心室及右心房电极至右室心尖和右心耳。与三腔脉冲发生器连接，脉冲发生器埋藏于左上胸皮下。

In an attempt to determine non-invasively the sino-atrial conduction time, we recorded the sinus node electric activity by placing bipolar electrodes at the level of the right atrium anteroposteriorly across the chest of the dog.

本实验采用成年狗，以6极心导管电极从颈外静脉插至上腔静脉与右心房交界处，能记录到一个在心电图P波以前19—26毫秒的&P前波&。通过夹除窦房结和高血钾等实验证明，&P前波&可与P波分离而存在，并随窦房结夹除而消失。

The sinoatrial node is located at the junction of the superior vena cava and the right atrium.

窦房结位于上腔静脉与右心房的交界处。

I am sure after a few weeks of adaptation and familiarization I will have no difficulty in functioning on a daily basis in an English speaking society or in participating fully in graduate studies.

在大学的三年的学习生活不仅给予我自身的充实，更重要的是磨练和培养了我较强的自觉能力和严谨，踏实的作风以及不怕困难的精神，对未来充满了信心！

As the first volcanoes erupted, one of the gases that bellowed out was steam.

在第一批火山喷发时，喷出的气体之一就是水蒸汽。