平行于穿孔卡短边的一行穿孔位置。
A line of punch positions parallel to the shorter edges of a punch card.
新设置的工作台能准确的调整穿孔位置。
有几个原因可以来解释为什么有时候会看不到阑尾，包括盲肠后的位置，正常阑尾，穿孔，和尖端周围发炎。
There are several reasons why the appendix may not be visualized, including retro-cecal location, normal appendix, perforation, and inflammation around the distal tip.
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