Researchers made this connection after discovering a 380-million-year-old female specimen that still retained a single embryo connected by an umbilical cord.
研究人员在发现了一个3.8 亿年前的标本还保有一个连着脐带的胚胎，由此得出了这一结论。
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Never carry a tool by the cord or hose, as you may damage both and loosen the connection to the tool.