umbilical cord
noun [ C usually singular ] uk/ʌmˈbɪl.ɪ.kəl ˌkɔːd/ us/ʌmˈbɪl.ɪ.kəl ˌkɔːrd/
脐带
the long, tube-like structure that connects a baby that has not yet been born to its mother's placenta (= the organ that provides it with food and oxygen)
The nurse cut the baby's umbilical cord. 护士剪掉了婴儿的脐带。