由于年代久遠(yuǎn),其淵源已無(wú)法考證.It has an origin lost in the mists of antiquity.我不知道這則舊傳聞的出處，我從來(lái)沒(méi)能考證出結(jié)果。I don't know where that old story came from, I've never been able to track it down.博物學(xué)中雖然有許多類似的假設(shè)，卻從沒(méi)人對(duì)此考證過(guò)。But as with ma...