| 单词 | 脊索 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔cephalochordate〕Any of various primitive chordate animals of the subphylum Cephalochordata, such as the lancet, that lack a true vertebral column.头索动物：头索动物亚门的一种原始脊索动物，如帆蜥鱼，无真正的脊柱美国传统〔chordoma〕Currently, surgery and radiation are the only standard treatment options for chordoma.目前外科手术和放射治疗是治疗脊索瘤的标准方法。剑桥高阶〔enterocoele〕The coelom formed from a pocketlike outgrowth of the wall of the archenteron, especially in echinoderms and chordates.肠体腔：由原肠壁的袋装生长而形成的体腔，尤其存在于棘皮动物和脊索动物中美国传统〔hemichordate〕Any of various wormlike marine animals of the phylum Hemichordata, having a primitive notochord and gill slits.半索动物：半索动物门中类似蠕虫的海生动物的任何一种，具有原始的脊索和鳃腔外口美国传统〔mesomere〕The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.中胚叶节：脊索类脊椎动物胚胎的中胚层的中间部分，最终会发育成排泄组织美国传统〔notochord〕A flexible rodlike structure that forms the main support of the body in the lowest chordates, such as the lancelet; a primitive backbone.脊索：细胞构成的一条纵长可弯曲的杆状结构，其作用是引导产生神经板，形成躯体的支持轴美国传统〔notochord〕A similar structure in embryos of higher vertebrates, from which the spinal column develops.脊索：更为高等的脊椎动物胚胎中的类似结构，脊椎骨由此发育美国传统〔somite〕A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae.体节：脊椎动物胚胎中胚层中的体节物质，沿脊索成对出现，后生长成肌肉或脊椎美国传统〔urochordate〕A chordate marine animal of the subphylum Urochordata; a tunicate.尾索动物：尾索动物亚门的海生脊索动物；被囊动物美国传统〔urochord〕A notochord limited to the caudal region, characteristic of the urochordates.尾索：限于尾部的脊索，有尾索动物的特征美国传统 |
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