| 单词 | notochord |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔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〔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〔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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