MAIN OUTCOME MEASURES: mechanical characters of elongation and mechanical characters of viscoelasticity of superior trunk of brachial plexus nerve.

主要观察指标：臂丛神经上干的拉伸力学性质和黏弹性力学性质。

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Superior trunk of brachial plexus nerve was performed stress relaxation test and creeping test, and data and curve of stress relaxation test and creeping test were obtained.

对臂丛神经上干进行应力松弛实验和蠕变实验，得出应力松弛、蠕变实验数据和曲线。

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The segment of the superior mesenteric vein between the two confluences of the gastrocolic vein and ths ileocolic vein is called the "surgical trunk".

位于胃结肠静脉和回结肠静脉注入下腔静脉处之间的一段肠系膜上静脉被命名为“外科干”。

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