常見(jiàn)例句雙語(yǔ)例句The primordial gonad, genital fold which composed of epithelial cells formed below the nephridium area 12 days after hatching.魚(yú)苗出膜12天，在其腎管區(qū)下方可見(jiàn)有一棒狀突起，由上皮細(xì)胞構(gòu)成，為生殖腺原基。 返回 genital fold