名词
中文翻译：脐带
同义词：
['placenta', 'umbilical cord', 'placental cord']
例句：
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1.The baby's umbilical cord was wrapped tightly around his neck.
宝宝的脐带紧紧地绕在他的脖子上。
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2.The doctor performed a cesarean section to remove the umbilical cord.
医生进行了剖腹产手术，取出了脐带。
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3. Umbilical cord blood is often used for stem cell research.
脐带血通常用于干细胞研究。