ostracoderm
[古生] 甲胄鱼类
例句
Hill walkers find dinosaur bones sticking out of hillsides: schoolchildren pick up ostracoderm skeletons on the beach.
登山者们会发现山坡上露出的恐龙骨骼,小学生们会在海滩上捡到甲胄鱼(ostracoderm)的骨骼。