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Fetal umbilical cord: Umbilical artery 2, W-shaped neck skin pressure traces can be seen .

胎儿脐带：脐动脉2条，颈部皮肤可见W形压迹。

The article begin the investigation from the motive of the poverty college student's intercourse, then analysis the attributions of this intercourse, include: intercourse objects, intercourse frequency, intercourse predomination, intercourse stability, intercourse self-satisfying, and so on.

文章首先从贫困大学生交往的目的入手，分析了贫困大学生人际交往的属性，包括交往的对象、交往的频度、交往的支配性、交往的稳定性、以及交往的自我效能感等，然后还研究了贫困大学生人际交往的对象特质。