... 头甲鱼；大头鱼 Cephalaspis 头部形成 cephalisation 头索动物纲；无头纲 Cephalochordata(Acrania) ...
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N (in the evolution of animals) development of a head by the concentration of feeding and sensory organs and nervous tissue at the anterior end (动物进化过程中)向头集中
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