OBSabbr.观察(=Observation）abbr.瞭望台（=Observatory）abbr.已废的(=Obsolete)abbr.无线电定向标选择器(=Omnibearing Selector)obsequyn.葬仪；名复: obsequies

1. One specimen is even preserved in the birth canal.
   一个样本甚至在产道中被保存了下来。
2. Turn the little oval skull face-forward, and it drops neatly into the pelvic brim, the beginning of the birth canal.
   把这个小小的椭圆形头颅脸朝前，便能巧妙地滑入骨盆缘，那里即是产道开始的地方。