| 单词 | umbilical cord | 
| 释义 | umbilical cordnoun1  a    : a cord arising from the navel that connects the fetus with the placenta and through which respiratory gases, nutrients, and wastes pass    b    : yolk stalk   2   : a tethering or supply line (as for an astronaut outside a spacecraft or a diver underwater)   3   : a necessary, supportive, or nurturing link or connection   | 
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