primary

primary body cavity - 原始體腔

primary bone - 原始骨

primary eyeglass - 原眼鏡

primary gill rakers - 原鰓耙

primary heart valves - 原心瓣

primary joint of jaw - 原頷連接

primary lamellae - 原始片

primary male - 初級雄性

primary oocyte - 初級卵母細胞

primary optic center - 初級視覺中心

primary osteon - 初級骨

primary pectoral girdle - 原肩帶

primary rakers - 初級鰓耙

primary sensory cells - 原感覺細胞

primary sperm duct - 初級輸精管

primary spermatocyte - 初級精母細胞

primary tractus olfactorius - 初嗅束

primary upper jaw - 原上頷

primary urinary duct - 初級輸尿管

primary urine - 初生尿

primary vascular wall - 初生血管壁

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