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原头
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原头【医】 protocephalon 原头yuántóu(1)[protocephalon](2)昆虫胚胎的部分,由口前叶和第一口后体节所组成(3)原始节足动物的头部,相当于感觉器官而与较高级形态的头部取食部分相区别,大概相当于环节动物的口前叶
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under mild restriction
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undermining caries
undermining enamel
undermining resorption
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更新时间:2026/11/1 23:27:45