umbilical cord

flexible tube of tissue connecting the placenta to the navel of the foetus and carryingnourishment to it before birth 脐带: (fig 比喻) By leavingmy parents' home, I cut/broke the umbilical cord. 我离开父母开始自立.

ulcerate, ulceration, ulcerous, ulna, ulterior, ultimate, ultimately, ultimatum, ultimo, ultra violet, ultra-, ultramarine, ultrasonic, ultrasound, ultraviolet, ululate, ululation, Ulyanovsk, umber, umbilical, umbilicus, umbra, umbrage, umbrella, umlaut, umpire, umpteen, umpteenth, un, un-, un-American, unabashed, unabated, unable, unabridged, unacceptable, unacceptably, unaccommodating, unaccompanied, unaccountable,