any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth
双语例句
Any of various marine worms of the phylum Chaetognatha,which includes the arrow worms. 毛颚类海虫毛颚类动物门的一种海生虫，包括箭虫。
