常見例句用作名詞 (n.)The pronephros does not function, but it marks at the fourth week of development the start of renal development.前腎生腎節(jié)內，從頭側至尾端先后出現橫行前腎小管，內側端開口于胚內體腔，外側端與頭尾走行的前腎管相通。 返回 pronephroi