单词 ridge pole
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时间: 2026-09-30 05:58:21
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1·Primordial germ cells came from pole cells and moved in two masses to the laterodorsal abdomen of embryo, and then were enveloped by mesoderm to form germinal ridge.
原始生殖细胞来自极细胞,分两团移至胚胎腹部侧背面,被中胚层细胞包裹,形成生殖脊。