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germ-layer theory
释义
germ-layer theory
germ-layer theory
[
′jərm ‚lā·ər ‚thē·ə·rē
]
(embryology)
The theory that three primary germ layers, ectoderm, mesoderm, and endoderm, are established in the early embryo and all organs and structures are derived from a specific germ layer.
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更新时间:2026/6/18 23:18:05