TPO 36 阅读: Early Ideas About Deep-Sea Biology
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It brought back mud laced with worms, and starfish that dad entangled
themselves in the line at depths well below the supposed boundary of the
azoic zone.
请问为什么会出现"dad"?? 这是哪种特殊用法? 还是打错字或赘字?

单纯是漏字。本来要打的是dead才对。