常见例句双语例句AIM: To study the value of oral ferric ammonium citrate(FAC) solution as a negative gastrointestinal contrast agent in MR urography(MRU).目的：研究枸橼酸铁铵作为胃肠道阴性对比剂对改善磁共振尿路成像（MRU）质量的价值。 返回 oral urography