parallel vertical rifled tubes 垂直并联内螺纹管
Telescopic shock absorber: piece formed of two parallel tubes, each consisting of two parts, one enclosing the other.
伸缩式减震器：计件形成的两平行管，每组由两部分组成，一并附其他。
Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.
哺乳动物将营养物质输送到骨细胞的微小管道是平行排列的，而鸟类的管道则是随机排列的。
In a cat's throat, for example, the two tubes run roughly horizontal and parallel to each other before heading on to the stomach and lung, respectively.
举个例子，猫的喉咙里这两种管子大致是平行分布，然后各自到达胃和肺部。
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