a passage in the uterus and vagina through which a fetus passes during vaginal birth
双语例句
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。
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。
